Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 5058 insertions, 0 deletions

diff --git a/Source/WebCore/dom/Document.cpp b/Source/WebCore/dom/Document.cpp
new file mode 100644
index 0000000..0c865c9
--- /dev/null
+++ b/Source/WebCore/dom/Document.cpp
@@ -0,0 +1,5058 @@
+/*
+ * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
+ *           (C) 1999 Antti Koivisto (koivisto@kde.org)
+ *           (C) 2001 Dirk Mueller (mueller@kde.org)
+ *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+ * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
+ * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "config.h"
+#include "Document.h"
+
+#include "AXObjectCache.h"
+#include "AnimationController.h"
+#include "AsyncScriptRunner.h"
+#include "Attr.h"
+#include "Attribute.h"
+#include "CDATASection.h"
+#include "CSSStyleSelector.h"
+#include "CSSStyleSheet.h"
+#include "CSSValueKeywords.h"
+#include "CachedCSSStyleSheet.h"
+#include "CachedResourceLoader.h"
+#include "Chrome.h"
+#include "ChromeClient.h"
+#include "Comment.h"
+#include "Console.h"
+#include "CookieJar.h"
+#include "CustomEvent.h"
+#include "DateComponents.h"
+#include "DOMImplementation.h"
+#include "DOMWindow.h"
+#include "DeviceMotionEvent.h"
+#include "DeviceOrientationEvent.h"
+#include "DocumentFragment.h"
+#include "DocumentLoader.h"
+#include "DocumentMarkerController.h"
+#include "DocumentType.h"
+#include "EditingText.h"
+#include "Editor.h"
+#include "EntityReference.h"
+#include "Event.h"
+#include "EventHandler.h"
+#include "EventListener.h"
+#include "EventNames.h"
+#include "EventQueue.h"
+#include "ExceptionCode.h"
+#include "FocusController.h"
+#include "FormAssociatedElement.h"
+#include "Frame.h"
+#include "FrameLoader.h"
+#include "FrameLoaderClient.h"
+#include "FrameTree.h"
+#include "FrameView.h"
+#include "HashChangeEvent.h"
+#include "HTMLAllCollection.h"
+#include "HTMLAnchorElement.h"
+#include "HTMLBodyElement.h"
+#include "HTMLCanvasElement.h"
+#include "HTMLCollection.h"
+#include "HTMLDocument.h"
+#include "HTMLElementFactory.h"
+#include "HTMLFrameOwnerElement.h"
+#include "HTMLHeadElement.h"
+#include "HTMLIFrameElement.h"
+#include "HTMLInputElement.h"
+#include "HTMLLinkElement.h"
+#include "HTMLMapElement.h"
+#include "HTMLNameCollection.h"
+#include "HTMLNames.h"
+#include "HTMLParserIdioms.h"
+#include "HTMLStyleElement.h"
+#include "HTMLTitleElement.h"
+#include "HTTPParsers.h"
+#include "HitTestRequest.h"
+#include "HitTestResult.h"
+#include "ImageLoader.h"
+#include "InspectorController.h"
+#include "InspectorInstrumentation.h"
+#include "KeyboardEvent.h"
+#include "Logging.h"
+#include "MediaQueryList.h"
+#include "MediaQueryMatcher.h"
+#include "MessageEvent.h"
+#include "MouseEvent.h"
+#include "MouseEventWithHitTestResults.h"
+#include "MutationEvent.h"
+#include "NameNodeList.h"
+#include "NodeFilter.h"
+#include "NodeIterator.h"
+#include "NodeWithIndex.h"
+#include "OverflowEvent.h"
+#include "Page.h"
+#include "PageGroup.h"
+#include "PageTransitionEvent.h"
+#include "PlatformKeyboardEvent.h"
+#include "PopStateEvent.h"
+#include "ProcessingInstruction.h"
+#include "ProgressEvent.h"
+#include "RegisteredEventListener.h"
+#include "RenderArena.h"
+#include "RenderLayer.h"
+#include "RenderTextControl.h"
+#include "RenderView.h"
+#include "RenderWidget.h"
+#include "ScriptController.h"
+#include "ScriptElement.h"
+#include "ScriptEventListener.h"
+#include "SecurityOrigin.h"
+#include "SegmentedString.h"
+#include "SelectionController.h"
+#include "Settings.h"
+#include "StaticHashSetNodeList.h"
+#include "StyleSheetList.h"
+#include "TextEvent.h"
+#include "TextResourceDecoder.h"
+#include "Timer.h"
+#include "TransformSource.h"
+#include "TreeWalker.h"
+#include "UIEvent.h"
+#include "UserContentURLPattern.h"
+#include "WebKitAnimationEvent.h"
+#include "WebKitTransitionEvent.h"
+#include "WheelEvent.h"
+#include "XMLDocumentParser.h"
+#include "XMLHttpRequest.h"
+#include "XMLNSNames.h"
+#include "XMLNames.h"
+#include "XSSAuditor.h"
+#include "htmlediting.h"
+#include <wtf/CurrentTime.h>
+#include <wtf/HashFunctions.h>
+#include <wtf/MainThread.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/StdLibExtras.h>
+#include <wtf/text/StringBuffer.h>
+
+#if ENABLE(SHARED_WORKERS)
+#include "SharedWorkerRepository.h"
+#endif
+
+#if ENABLE(DOM_STORAGE)
+#include "StorageEvent.h"
+#endif
+
+#if ENABLE(XPATH)
+#include "XPathEvaluator.h"
+#include "XPathExpression.h"
+#include "XPathNSResolver.h"
+#include "XPathResult.h"
+#endif
+
+#if ENABLE(XSLT)
+#include "XSLTProcessor.h"
+#endif
+
+#if ENABLE(SVG)
+#include "SVGDocumentExtensions.h"
+#include "SVGElementFactory.h"
+#include "SVGNames.h"
+#include "SVGStyleElement.h"
+#include "SVGZoomEvent.h"
+#endif
+
+#ifdef ANDROID_META_SUPPORT
+#include "PlatformBridge.h"
+#include "Settings.h"
+#endif
+
+#ifdef ANDROID_RESET_SELECTION
+#include "CacheBuilder.h"
+#include "HTMLTextAreaElement.h"
+#endif
+
+#ifdef ANDROID_INSTRUMENT
+#include "TimeCounter.h"
+#endif
+
+#if ENABLE(TOUCH_EVENTS)
+#if USE(V8)
+#include "RuntimeEnabledFeatures.h"
+#endif
+#include "TouchEvent.h"
+#endif
+
+#if ENABLE(WML)
+#include "WMLDocument.h"
+#include "WMLElement.h"
+#include "WMLElementFactory.h"
+#include "WMLNames.h"
+#endif
+
+#if ENABLE(MATHML)
+#include "MathMLElement.h"
+#include "MathMLElementFactory.h"
+#include "MathMLNames.h"
+#endif
+
+#if ENABLE(XHTMLMP)
+#include "HTMLNoScriptElement.h"
+#endif
+
+#if ENABLE(FULLSCREEN_API)
+#include "RenderFullScreen.h"
+#endif
+
+using namespace std;
+using namespace WTF;
+using namespace Unicode;
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+// #define INSTRUMENT_LAYOUT_SCHEDULING 1
+
+// This amount of time must have elapsed before we will even consider scheduling a layout without a delay.
+// FIXME: For faster machines this value can really be lowered to 200.  250 is adequate, but a little high
+// for dual G5s. :)
+static const int cLayoutScheduleThreshold = 250;
+
+// These functions can't have internal linkage because they are used as template arguments.
+bool keyMatchesId(AtomicStringImpl*, Element*);
+bool keyMatchesMapName(AtomicStringImpl*, Element*);
+bool keyMatchesLowercasedMapName(AtomicStringImpl*, Element*);
+
+// DOM Level 2 says (letters added):
+//
+// a) Name start characters must have one of the categories Ll, Lu, Lo, Lt, Nl.
+// b) Name characters other than Name-start characters must have one of the categories Mc, Me, Mn, Lm, or Nd.
+// c) Characters in the compatibility area (i.e. with character code greater than #xF900 and less than #xFFFE) are not allowed in XML names.
+// d) Characters which have a font or compatibility decomposition (i.e. those with a "compatibility formatting tag" in field 5 of the database -- marked by field 5 beginning with a "<") are not allowed.
+// e) The following characters are treated as name-start characters rather than name characters, because the property file classifies them as Alphabetic: [#x02BB-#x02C1], #x0559, #x06E5, #x06E6.
+// f) Characters #x20DD-#x20E0 are excluded (in accordance with Unicode, section 5.14).
+// g) Character #x00B7 is classified as an extender, because the property list so identifies it.
+// h) Character #x0387 is added as a name character, because #x00B7 is its canonical equivalent.
+// i) Characters ':' and '_' are allowed as name-start characters.
+// j) Characters '-' and '.' are allowed as name characters.
+//
+// It also contains complete tables. If we decide it's better, we could include those instead of the following code.
+
+static inline bool isValidNameStart(UChar32 c)
+{
+    // rule (e) above
+    if ((c >= 0x02BB && c <= 0x02C1) || c == 0x559 || c == 0x6E5 || c == 0x6E6)
+        return true;
+
+    // rule (i) above
+    if (c == ':' || c == '_')
+        return true;
+
+    // rules (a) and (f) above
+    const uint32_t nameStartMask = Letter_Lowercase | Letter_Uppercase | Letter_Other | Letter_Titlecase | Number_Letter;
+    if (!(Unicode::category(c) & nameStartMask))
+        return false;
+
+    // rule (c) above
+    if (c >= 0xF900 && c < 0xFFFE)
+        return false;
+
+    // rule (d) above
+    DecompositionType decompType = decompositionType(c);
+    if (decompType == DecompositionFont || decompType == DecompositionCompat)
+        return false;
+
+    return true;
+}
+
+static inline bool isValidNamePart(UChar32 c)
+{
+    // rules (a), (e), and (i) above
+    if (isValidNameStart(c))
+        return true;
+
+    // rules (g) and (h) above
+    if (c == 0x00B7 || c == 0x0387)
+        return true;
+
+    // rule (j) above
+    if (c == '-' || c == '.')
+        return true;
+
+    // rules (b) and (f) above
+    const uint32_t otherNamePartMask = Mark_NonSpacing | Mark_Enclosing | Mark_SpacingCombining | Letter_Modifier | Number_DecimalDigit;
+    if (!(Unicode::category(c) & otherNamePartMask))
+        return false;
+
+    // rule (c) above
+    if (c >= 0xF900 && c < 0xFFFE)
+        return false;
+
+    // rule (d) above
+    DecompositionType decompType = decompositionType(c);
+    if (decompType == DecompositionFont || decompType == DecompositionCompat)
+        return false;
+
+    return true;
+}
+
+static Widget* widgetForNode(Node* focusedNode)
+{
+    if (!focusedNode)
+        return 0;
+    RenderObject* renderer = focusedNode->renderer();
+    if (!renderer || !renderer->isWidget())
+        return 0;
+    return toRenderWidget(renderer)->widget();
+}
+
+static bool acceptsEditingFocus(Node* node)
+{
+    ASSERT(node);
+    ASSERT(node->isContentEditable());
+
+    Node* root = node->rootEditableElement();
+    Frame* frame = node->document()->frame();
+    if (!frame || !root)
+        return false;
+
+    return frame->editor()->shouldBeginEditing(rangeOfContents(root).get());
+}
+
+static bool disableRangeMutation(Page* page)
+{
+#if PLATFORM(MAC)
+    // Disable Range mutation on document modifications in Tiger and Leopard Mail
+    // See <rdar://problem/5865171>
+    return page && (page->settings()->needsLeopardMailQuirks() || page->settings()->needsTigerMailQuirks());
+#else
+    return false;
+#endif
+}
+
+static HashSet<Document*>* documentsThatNeedStyleRecalc = 0;
+
+class DocumentWeakReference : public ThreadSafeShared<DocumentWeakReference> {
+public:
+    static PassRefPtr<DocumentWeakReference> create(Document* document)
+    {
+        return adoptRef(new DocumentWeakReference(document));
+    }
+
+    Document* document()
+    {
+        ASSERT(isMainThread());
+        return m_document;
+    }
+
+    void clear()
+    {
+        ASSERT(isMainThread());
+        m_document = 0;
+    }
+
+private:
+    DocumentWeakReference(Document* document)
+        : m_document(document)
+    {
+        ASSERT(isMainThread());
+    }
+
+    Document* m_document;
+};
+
+Document::Document(Frame* frame, const KURL& url, bool isXHTML, bool isHTML, const KURL& baseURL)
+    : ContainerNode(0)
+    , m_compatibilityMode(NoQuirksMode)
+    , m_compatibilityModeLocked(false)
+    , m_domTreeVersion(0)
+#ifdef ANDROID_STYLE_VERSION
+    , m_styleVersion(0)
+#endif
+    , m_styleSheets(StyleSheetList::create(this))
+    , m_readyState(Complete)
+    , m_styleRecalcTimer(this, &Document::styleRecalcTimerFired)
+    , m_pendingStyleRecalcShouldForce(false)
+    , m_frameElementsShouldIgnoreScrolling(false)
+    , m_containsValidityStyleRules(false)
+    , m_updateFocusAppearanceRestoresSelection(false)
+    , m_ignoreDestructiveWriteCount(0)
+    , m_title("")
+    , m_rawTitle("")
+    , m_titleSetExplicitly(false)
+    , m_updateFocusAppearanceTimer(this, &Document::updateFocusAppearanceTimerFired)
+    , m_startTime(currentTime())
+    , m_overMinimumLayoutThreshold(false)
+    , m_extraLayoutDelay(0)
+    , m_asyncScriptRunner(AsyncScriptRunner::create(this))
+    , m_xmlVersion("1.0")
+    , m_xmlStandalone(false)
+    , m_savedRenderer(0)
+    , m_designMode(inherit)
+    , m_selfOnlyRefCount(0)
+#if ENABLE(SVG)
+    , m_svgExtensions(0)
+#endif
+#if ENABLE(DASHBOARD_SUPPORT)
+    , m_hasDashboardRegions(false)
+    , m_dashboardRegionsDirty(false)
+#endif
+    , m_accessKeyMapValid(false)
+    , m_createRenderers(true)
+    , m_inPageCache(false)
+    , m_useSecureKeyboardEntryWhenActive(false)
+    , m_isXHTML(isXHTML)
+    , m_isHTML(isHTML)
+    , m_numNodeListCaches(0)
+#if USE(JSC)
+    , m_normalWorldWrapperCache(0)
+#endif
+    , m_usingGeolocation(false)
+    , m_eventQueue(adoptPtr(new EventQueue))
+#if ENABLE(WML)
+    , m_containsWMLContent(false)
+#endif
+    , m_weakReference(DocumentWeakReference::create(this))
+    , m_idAttributeName(idAttr)
+#if ENABLE(FULLSCREEN_API)
+    , m_isFullScreen(0)
+    , m_areKeysEnabledInFullScreen(0)
+    , m_fullScreenRenderer(0)
+    , m_fullScreenChangeDelayTimer(this, &Document::fullScreenChangeDelayTimerFired)
+#endif
+    , m_loadEventDelayCount(0)
+    , m_loadEventDelayTimer(this, &Document::loadEventDelayTimerFired)
+    , m_directionSetOnDocumentElement(false)
+    , m_writingModeSetOnDocumentElement(false)
+{
+    m_document = this;
+
+    m_pageGroupUserSheetCacheValid = false;
+
+    m_printing = false;
+    m_paginatedForScreen = false;
+
+    m_ignoreAutofocus = false;
+
+    m_frame = frame;
+
+    if (frame || !url.isEmpty())
+        setURL(url);
+
+    // Setting of m_baseURL needs to happen after the setURL call, since that
+    // calls updateBaseURL, which would clobber the passed in value.
+    if (!baseURL.isNull())
+        m_baseURL = baseURL;
+
+#if !PLATFORM(ANDROID)
+    m_axObjectCache = 0;
+#endif
+
+    m_markers = new DocumentMarkerController();
+
+    m_cachedResourceLoader = new CachedResourceLoader(this);
+
+    m_visuallyOrdered = false;
+    m_bParsing = false;
+    m_wellFormed = false;
+
+    m_textColor = Color::black;
+    m_listenerTypes = 0;
+    setInDocument();
+    m_inStyleRecalc = false;
+    m_closeAfterStyleRecalc = false;
+
+    m_usesDescendantRules = false;
+    m_usesSiblingRules = false;
+    m_usesFirstLineRules = false;
+    m_usesFirstLetterRules = false;
+    m_usesBeforeAfterRules = false;
+    m_usesRemUnits = false;
+    m_usesLinkRules = false;
+
+    m_gotoAnchorNeededAfterStylesheetsLoad = false;
+ 
+    m_didCalculateStyleSelector = false;
+    m_pendingStylesheets = 0;
+    m_ignorePendingStylesheets = false;
+    m_hasNodesWithPlaceholderStyle = false;
+    m_pendingSheetLayout = NoLayoutWithPendingSheets;
+
+    m_cssTarget = 0;
+
+    resetLinkColor();
+    resetVisitedLinkColor();
+    resetActiveLinkColor();
+
+    m_processingLoadEvent = false;
+    
+    initSecurityContext();
+    initDNSPrefetch();
+
+    static int docID = 0;
+    m_docID = docID++;
+#if ENABLE(XHTMLMP)
+    m_shouldProcessNoScriptElement = !(m_frame && m_frame->script()->canExecuteScripts(NotAboutToExecuteScript));
+#endif
+}
+
+inline void Document::DocumentOrderedMap::clear()
+{
+    m_map.clear();
+    m_duplicateCounts.clear();
+}
+
+void Document::removedLastRef()
+{
+    ASSERT(!m_deletionHasBegun);
+    if (m_selfOnlyRefCount) {
+        // If removing a child removes the last self-only ref, we don't
+        // want the document to be destructed until after
+        // removeAllChildren returns, so we guard ourselves with an
+        // extra self-only ref.
+        selfOnlyRef();
+
+        // We must make sure not to be retaining any of our children through
+        // these extra pointers or we will create a reference cycle.
+        m_docType = 0;
+        m_focusedNode = 0;
+        m_hoverNode = 0;
+        m_activeNode = 0;
+        m_titleElement = 0;
+        m_documentElement = 0;
+#if ENABLE(FULLSCREEN_API)
+        m_fullScreenElement = 0;
+#endif
+
+        // removeAllChildren() doesn't always unregister IDs, do it upfront to avoid having stale references in the map.
+        m_elementsById.clear();
+
+        removeAllChildren();
+
+        m_markers->detach();
+
+        detachParser();
+
+        m_cssCanvasElements.clear();
+
+#ifndef NDEBUG
+        m_inRemovedLastRefFunction = false;
+#endif
+
+        selfOnlyDeref();
+    } else {
+#ifndef NDEBUG
+        m_deletionHasBegun = true;
+#endif
+        delete this;
+    }
+}
+
+Document::~Document()
+{
+    ASSERT(!renderer());
+    ASSERT(!m_inPageCache);
+    ASSERT(!m_savedRenderer);
+    ASSERT(m_ranges.isEmpty());
+    ASSERT(!m_styleRecalcTimer.isActive());
+
+    m_asyncScriptRunner.clear();
+
+    removeAllEventListeners();
+
+#if USE(JSC)
+    destroyAllWrapperCaches();
+#endif
+
+    // Currently we believe that Document can never outlive the parser.
+    // Although the Document may be replaced synchronously, DocumentParsers
+    // generally keep at least one reference to an Element which would in turn
+    // has a reference to the Document.  If you hit this ASSERT, then that
+    // assumption is wrong.  DocumentParser::detach() should ensure that even
+    // if the DocumentParser outlives the Document it won't cause badness.
+    ASSERT(!m_parser || m_parser->refCount() == 1);
+    detachParser();
+    m_document = 0;
+    m_cachedResourceLoader.clear();
+
+    m_renderArena.clear();
+
+    clearAXObjectCache();
+
+    m_decoder = 0;
+
+    for (size_t i = 0; i < m_nameCollectionInfo.size(); ++i)
+        deleteAllValues(m_nameCollectionInfo[i]);
+
+    if (m_styleSheets)
+        m_styleSheets->documentDestroyed();
+
+    if (m_elemSheet)
+        m_elemSheet->clearOwnerNode();
+    if (m_mappedElementSheet)
+        m_mappedElementSheet->clearOwnerNode();
+    if (m_pageUserSheet)
+        m_pageUserSheet->clearOwnerNode();
+    if (m_pageGroupUserSheets) {
+        for (size_t i = 0; i < m_pageGroupUserSheets->size(); ++i)
+            (*m_pageGroupUserSheets)[i]->clearOwnerNode();
+    }
+
+    m_weakReference->clear();
+
+    if (m_mediaQueryMatcher)
+        m_mediaQueryMatcher->documentDestroyed();
+}
+
+MediaQueryMatcher* Document::mediaQueryMatcher()
+{
+    if (!m_mediaQueryMatcher)
+        m_mediaQueryMatcher = MediaQueryMatcher::create(this);
+    return m_mediaQueryMatcher.get();
+}
+
+#if USE(JSC)
+Document::JSWrapperCache* Document::createWrapperCache(DOMWrapperWorld* world)
+{
+    JSWrapperCache* wrapperCache = new JSWrapperCache;
+    m_wrapperCacheMap.set(world, wrapperCache);
+    if (world->isNormal()) {
+        ASSERT(!m_normalWorldWrapperCache);
+        m_normalWorldWrapperCache = wrapperCache;
+    }
+    world->didCreateWrapperCache(this);
+    return wrapperCache;
+}
+
+void Document::destroyWrapperCache(DOMWrapperWorld* world)
+{
+    Document::JSWrapperCache* wrappers = wrapperCacheMap().take(world);
+    ASSERT(wrappers);
+    delete wrappers;
+    world->didDestroyWrapperCache(this);
+}
+
+void Document::destroyAllWrapperCaches()
+{
+    JSWrapperCacheMap& wrapperCacheMap = this->wrapperCacheMap();
+    while (!wrapperCacheMap.isEmpty())
+        destroyWrapperCache(wrapperCacheMap.begin()->first);
+}
+#endif
+
+void Document::setCompatibilityMode(CompatibilityMode mode)
+{
+    if (m_compatibilityModeLocked || mode == m_compatibilityMode)
+        return;
+    ASSERT(!documentElement() && !m_styleSheets->length());
+    bool wasInQuirksMode = inQuirksMode();
+    m_compatibilityMode = mode;
+    if (inQuirksMode() != wasInQuirksMode) {
+        // All user stylesheets have to reparse using the different mode.
+        clearPageUserSheet();
+        clearPageGroupUserSheets();
+    }
+}
+
+String Document::compatMode() const
+{
+    return inQuirksMode() ? "BackCompat" : "CSS1Compat";
+}
+
+void Document::resetLinkColor()
+{
+    m_linkColor = Color(0, 0, 238);
+}
+
+void Document::resetVisitedLinkColor()
+{
+    m_visitedLinkColor = Color(85, 26, 139);    
+}
+
+void Document::resetActiveLinkColor()
+{
+    m_activeLinkColor.setNamedColor("red");
+}
+
+void Document::setDocType(PassRefPtr<DocumentType> docType)
+{
+    // This should never be called more than once.
+    ASSERT(!m_docType || !docType);
+    m_docType = docType;
+    if (m_docType)
+        m_docType->setDocument(this);
+#ifdef ANDROID_META_SUPPORT
+    if (m_docType && !ownerElement()
+            && m_docType->publicId().startsWith("-//wapforum//dtd xhtml mobile 1.", false)) {
+        // fit mobile sites directly in the screen
+        if (Frame *f = frame())
+            f->settings()->setMetadataSettings("width", "device-width");
+        if (FrameView* frameView = view())
+            PlatformBridge::updateViewport(frameView);
+    }
+#endif
+}
+
+DOMImplementation* Document::implementation() const
+{
+    if (!m_implementation)
+        m_implementation = DOMImplementation::create();
+    return m_implementation.get();
+}
+
+void Document::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
+{
+    ContainerNode::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
+    
+    // Invalidate the document element we have cached in case it was replaced.
+    m_documentElement = 0;
+}
+
+void Document::cacheDocumentElement() const
+{
+    ASSERT(!m_documentElement);
+    Node* n = firstChild();
+    while (n && !n->isElementNode())
+        n = n->nextSibling();
+    m_documentElement = static_cast<Element*>(n);
+}
+
+PassRefPtr<Element> Document::createElement(const AtomicString& name, ExceptionCode& ec)
+{
+    if (!isValidName(name)) {
+        ec = INVALID_CHARACTER_ERR;
+        return 0;
+    }
+
+    if (m_isXHTML)
+        return HTMLElementFactory::createHTMLElement(QualifiedName(nullAtom, name, xhtmlNamespaceURI), this, 0, false);
+
+    return createElement(QualifiedName(nullAtom, name, nullAtom), false);
+}
+
+PassRefPtr<DocumentFragment> Document::createDocumentFragment()
+{
+    return DocumentFragment::create(document());
+}
+
+PassRefPtr<Text> Document::createTextNode(const String& data)
+{
+    return Text::create(this, data);
+}
+
+PassRefPtr<Comment> Document::createComment(const String& data)
+{
+    return Comment::create(this, data);
+}
+
+PassRefPtr<CDATASection> Document::createCDATASection(const String& data, ExceptionCode& ec)
+{
+    if (isHTMLDocument()) {
+        ec = NOT_SUPPORTED_ERR;
+        return 0;
+    }
+    return CDATASection::create(this, data);
+}
+
+PassRefPtr<ProcessingInstruction> Document::createProcessingInstruction(const String& target, const String& data, ExceptionCode& ec)
+{
+    if (!isValidName(target)) {
+        ec = INVALID_CHARACTER_ERR;
+        return 0;
+    }
+    if (isHTMLDocument()) {
+        ec = NOT_SUPPORTED_ERR;
+        return 0;
+    }
+    return ProcessingInstruction::create(this, target, data);
+}
+
+PassRefPtr<EntityReference> Document::createEntityReference(const String& name, ExceptionCode& ec)
+{
+    if (!isValidName(name)) {
+        ec = INVALID_CHARACTER_ERR;
+        return 0;
+    }
+    if (isHTMLDocument()) {
+        ec = NOT_SUPPORTED_ERR;
+        return 0;
+    }
+    return EntityReference::create(this, name);
+}
+
+PassRefPtr<EditingText> Document::createEditingTextNode(const String& text)
+{
+    return EditingText::create(this, text);
+}
+
+PassRefPtr<CSSStyleDeclaration> Document::createCSSStyleDeclaration()
+{
+    return CSSMutableStyleDeclaration::create();
+}
+
+PassRefPtr<Node> Document::importNode(Node* importedNode, bool deep, ExceptionCode& ec)
+{
+    ec = 0;
+    
+    if (!importedNode
+#if ENABLE(SVG) && ENABLE(DASHBOARD_SUPPORT)
+        || (importedNode->isSVGElement() && page() && page()->settings()->usesDashboardBackwardCompatibilityMode())
+#endif
+        ) {
+        ec = NOT_SUPPORTED_ERR;
+        return 0;
+    }
+
+    switch (importedNode->nodeType()) {
+    case TEXT_NODE:
+        return createTextNode(importedNode->nodeValue());
+    case CDATA_SECTION_NODE:
+        return createCDATASection(importedNode->nodeValue(), ec);
+    case ENTITY_REFERENCE_NODE:
+        return createEntityReference(importedNode->nodeName(), ec);
+    case PROCESSING_INSTRUCTION_NODE:
+        return createProcessingInstruction(importedNode->nodeName(), importedNode->nodeValue(), ec);
+    case COMMENT_NODE:
+        return createComment(importedNode->nodeValue());
+    case ELEMENT_NODE: {
+        Element* oldElement = static_cast<Element*>(importedNode);
+        RefPtr<Element> newElement = createElementNS(oldElement->namespaceURI(), oldElement->tagQName().toString(), ec);
+                    
+        if (ec)
+            return 0;
+
+        NamedNodeMap* attrs = oldElement->attributes(true);
+        if (attrs) {
+            unsigned length = attrs->length();
+            for (unsigned i = 0; i < length; i++) {
+                Attribute* attr = attrs->attributeItem(i);
+                newElement->setAttribute(attr->name(), attr->value().impl(), ec);
+                if (ec)
+                    return 0;
+            }
+        }
+
+        newElement->copyNonAttributeProperties(oldElement);
+
+        if (deep) {
+            for (Node* oldChild = oldElement->firstChild(); oldChild; oldChild = oldChild->nextSibling()) {
+                RefPtr<Node> newChild = importNode(oldChild, true, ec);
+                if (ec)
+                    return 0;
+                newElement->appendChild(newChild.release(), ec);
+                if (ec)
+                    return 0;
+            }
+        }
+
+        return newElement.release();
+    }
+    case ATTRIBUTE_NODE:
+        return Attr::create(0, this, static_cast<Attr*>(importedNode)->attr()->clone());
+    case DOCUMENT_FRAGMENT_NODE: {
+        DocumentFragment* oldFragment = static_cast<DocumentFragment*>(importedNode);
+        RefPtr<DocumentFragment> newFragment = createDocumentFragment();
+        if (deep) {
+            for (Node* oldChild = oldFragment->firstChild(); oldChild; oldChild = oldChild->nextSibling()) {
+                RefPtr<Node> newChild = importNode(oldChild, true, ec);
+                if (ec)
+                    return 0;
+                newFragment->appendChild(newChild.release(), ec);
+                if (ec)
+                    return 0;
+            }
+        }
+        
+        return newFragment.release();
+    }
+    case ENTITY_NODE:
+    case NOTATION_NODE:
+        // FIXME: It should be possible to import these node types, however in DOM3 the DocumentType is readonly, so there isn't much sense in doing that.
+        // Ability to add these imported nodes to a DocumentType will be considered for addition to a future release of the DOM.
+    case DOCUMENT_NODE:
+    case DOCUMENT_TYPE_NODE:
+    case XPATH_NAMESPACE_NODE:
+        break;
+    }
+
+    ec = NOT_SUPPORTED_ERR;
+    return 0;
+}
+
+
+PassRefPtr<Node> Document::adoptNode(PassRefPtr<Node> source, ExceptionCode& ec)
+{
+    if (!source) {
+        ec = NOT_SUPPORTED_ERR;
+        return 0;
+    }
+
+    if (source->isReadOnlyNode()) {
+        ec = NO_MODIFICATION_ALLOWED_ERR;
+        return 0;
+    }
+
+    switch (source->nodeType()) {
+    case ENTITY_NODE:
+    case NOTATION_NODE:
+    case DOCUMENT_NODE:
+    case DOCUMENT_TYPE_NODE:
+    case XPATH_NAMESPACE_NODE:
+        ec = NOT_SUPPORTED_ERR;
+        return 0;            
+    case ATTRIBUTE_NODE: {                   
+        Attr* attr = static_cast<Attr*>(source.get());
+        if (attr->ownerElement())
+            attr->ownerElement()->removeAttributeNode(attr, ec);
+        attr->setSpecified(true);
+        break;
+    }       
+    default:
+        if (source->hasTagName(iframeTag)) {
+            HTMLIFrameElement* iframe = static_cast<HTMLIFrameElement*>(source.get());
+            if (frame() && frame()->tree()->isDescendantOf(iframe->contentFrame())) {
+                ec = HIERARCHY_REQUEST_ERR;
+                return 0;
+            }
+            iframe->setRemainsAliveOnRemovalFromTree(attached() && source->attached());
+        }
+
+        if (source->parentNode())
+            source->parentNode()->removeChild(source.get(), ec);
+    }
+                
+    for (Node* node = source.get(); node; node = node->traverseNextNode(source.get()))
+        node->setDocument(this);
+
+    return source;
+}
+
+bool Document::hasPrefixNamespaceMismatch(const QualifiedName& qName)
+{
+    // These checks are from DOM Core Level 2, createElementNS
+    // http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-DocCrElNS
+    if (!qName.prefix().isEmpty() && qName.namespaceURI().isNull()) // createElementNS(null, "html:div")
+        return true;
+    if (qName.prefix() == xmlAtom && qName.namespaceURI() != XMLNames::xmlNamespaceURI) // createElementNS("http://www.example.com", "xml:lang")
+        return true;
+
+    // Required by DOM Level 3 Core and unspecified by DOM Level 2 Core:
+    // http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.html#ID-DocCrElNS
+    // createElementNS("http://www.w3.org/2000/xmlns/", "foo:bar"), createElementNS(null, "xmlns:bar")
+    if ((qName.prefix() == xmlnsAtom && qName.namespaceURI() != XMLNSNames::xmlnsNamespaceURI) || (qName.prefix() != xmlnsAtom && qName.namespaceURI() == XMLNSNames::xmlnsNamespaceURI))
+        return true;
+
+    return false;
+}
+
+// FIXME: This should really be in a possible ElementFactory class
+PassRefPtr<Element> Document::createElement(const QualifiedName& qName, bool createdByParser)
+{
+    RefPtr<Element> e;
+
+    // FIXME: Use registered namespaces and look up in a hash to find the right factory.
+    if (qName.namespaceURI() == xhtmlNamespaceURI)
+        e = HTMLElementFactory::createHTMLElement(qName, this, 0, createdByParser);
+#if ENABLE(SVG)
+    else if (qName.namespaceURI() == SVGNames::svgNamespaceURI)
+        e = SVGElementFactory::createSVGElement(qName, this, createdByParser);
+#endif
+#if ENABLE(WML)
+    else if (qName.namespaceURI() == WMLNames::wmlNamespaceURI)
+        e = WMLElementFactory::createWMLElement(qName, this, createdByParser);
+    else if (isWMLDocument())
+        e = WMLElementFactory::createWMLElement(QualifiedName(nullAtom, qName.localName(), WMLNames::wmlNamespaceURI), this, createdByParser);
+#endif
+#if ENABLE(MATHML)
+    else if (qName.namespaceURI() == MathMLNames::mathmlNamespaceURI)
+        e = MathMLElementFactory::createMathMLElement(qName, this, createdByParser);
+#endif
+
+    if (!e)
+        e = Element::create(qName, document());
+
+    // <image> uses imgTag so we need a special rule.
+#if ENABLE(WML)
+    if (!isWMLDocument())
+#endif
+    ASSERT((qName.matches(imageTag) && e->tagQName().matches(imgTag) && e->tagQName().prefix() == qName.prefix()) || qName == e->tagQName());
+
+    return e.release();
+}
+
+PassRefPtr<Element> Document::createElementNS(const String& namespaceURI, const String& qualifiedName, ExceptionCode& ec)
+{
+    String prefix, localName;
+    if (!parseQualifiedName(qualifiedName, prefix, localName, ec))
+        return 0;
+
+    QualifiedName qName(prefix, localName, namespaceURI);
+    if (hasPrefixNamespaceMismatch(qName)) {
+        ec = NAMESPACE_ERR;
+        return 0;
+    }
+
+    return createElement(qName, false);
+}
+
+inline void Document::DocumentOrderedMap::add(AtomicStringImpl* key, Element* element)
+{
+    ASSERT(key);
+    ASSERT(element);
+
+    if (!m_duplicateCounts.contains(key)) {
+        // Fast path. The key is not already in m_duplicateCounts, so we assume that it's
+        // also not already in m_map and try to add it. If that add succeeds, we're done.
+        pair<Map::iterator, bool> addResult = m_map.add(key, element);
+        if (addResult.second)
+            return;
+
+        // The add failed, so this key was already cached in m_map.
+        // There are multiple elements with this key. Remove the m_map
+        // cache for this key so get searches for it next time it is called.
+        m_map.remove(addResult.first);
+        m_duplicateCounts.add(key);
+    } else {
+        // There are multiple elements with this key. Remove the m_map
+        // cache for this key so get will search for it next time it is called.
+        Map::iterator cachedItem = m_map.find(key);
+        if (cachedItem != m_map.end()) {
+            m_map.remove(cachedItem);
+            m_duplicateCounts.add(key);
+        }
+    }
+
+    m_duplicateCounts.add(key);
+}
+
+inline void Document::DocumentOrderedMap::remove(AtomicStringImpl* key, Element* element)
+{
+    ASSERT(key);
+    ASSERT(element);
+
+    m_map.checkConsistency();
+    Map::iterator cachedItem = m_map.find(key);
+    if (cachedItem != m_map.end() && cachedItem->second == element)
+        m_map.remove(cachedItem);
+    else
+        m_duplicateCounts.remove(key);
+}
+
+template<bool keyMatches(AtomicStringImpl*, Element*)> inline Element* Document::DocumentOrderedMap::get(AtomicStringImpl* key, const Document* document) const
+{
+    ASSERT(key);
+
+    m_map.checkConsistency();
+
+    Element* element = m_map.get(key);
+    if (element)
+        return element;
+
+    if (m_duplicateCounts.contains(key)) {
+        // We know there's at least one node that matches; iterate to find the first one.
+        for (Node* node = document->firstChild(); node; node = node->traverseNextNode()) {
+            if (!node->isElementNode())
+                continue;
+            element = static_cast<Element*>(node);
+            if (!keyMatches(key, element))
+                continue;
+            m_duplicateCounts.remove(key);
+            m_map.set(key, element);
+            return element;
+        }
+        ASSERT_NOT_REACHED();
+    }
+
+    return 0;
+}
+
+inline bool keyMatchesId(AtomicStringImpl* key, Element* element)
+{
+    return element->hasID() && element->getIdAttribute().impl() == key;
+}
+
+Element* Document::getElementById(const AtomicString& elementId) const
+{
+    if (elementId.isEmpty())
+        return 0;
+    return m_elementsById.get<keyMatchesId>(elementId.impl(), this);
+}
+
+String Document::readyState() const
+{
+    DEFINE_STATIC_LOCAL(const String, loading, ("loading"));
+    DEFINE_STATIC_LOCAL(const String, interactive, ("interactive"));
+    DEFINE_STATIC_LOCAL(const String, complete, ("complete"));
+
+    switch (m_readyState) {
+    case Loading:
+        return loading;
+    case Interactive:
+        return interactive;
+    case Complete:
+        return complete;
+    }
+
+    ASSERT_NOT_REACHED();
+    return String();
+}
+
+void Document::setReadyState(ReadyState readyState)
+{
+    if (readyState == m_readyState)
+        return;
+
+    switch (readyState) {
+    case Loading:
+        if (!m_documentTiming.domLoading)
+            m_documentTiming.domLoading = currentTime();
+        break;
+    case Interactive:
+        if (!m_documentTiming.domInteractive)
+            m_documentTiming.domInteractive = currentTime();
+        break;
+    case Complete:
+        if (!m_documentTiming.domComplete)
+            m_documentTiming.domComplete = currentTime();
+        break;
+    }
+
+    m_readyState = readyState;
+    dispatchEvent(Event::create(eventNames().readystatechangeEvent, false, false));
+}
+
+String Document::encoding() const
+{
+    if (TextResourceDecoder* d = decoder())
+        return d->encoding().domName();
+    return String();
+}
+
+String Document::defaultCharset() const
+{
+    if (Settings* settings = this->settings())
+        return settings->defaultTextEncodingName();
+    return String();
+}
+
+void Document::setCharset(const String& charset)
+{
+    if (!decoder())
+        return;
+    decoder()->setEncoding(charset, TextResourceDecoder::UserChosenEncoding);
+}
+
+void Document::setXMLVersion(const String& version, ExceptionCode& ec)
+{
+    if (!implementation()->hasFeature("XML", String())) {
+        ec = NOT_SUPPORTED_ERR;
+        return;
+    }
+
+    if (!XMLDocumentParser::supportsXMLVersion(version)) {
+        ec = NOT_SUPPORTED_ERR;
+        return;
+    }
+
+    m_xmlVersion = version;
+}
+
+void Document::setXMLStandalone(bool standalone, ExceptionCode& ec)
+{
+    if (!implementation()->hasFeature("XML", String())) {
+        ec = NOT_SUPPORTED_ERR;
+        return;
+    }
+
+    m_xmlStandalone = standalone;
+}
+
+void Document::setDocumentURI(const String& uri)
+{
+    m_documentURI = uri;
+    updateBaseURL();
+}
+
+KURL Document::baseURI() const
+{
+    return m_baseURL;
+}
+
+// FIXME: We need to discuss the DOM API here at some point. Ideas:
+// * making it receive a rect as parameter, i.e. nodesFromRect(x, y, w, h);
+// * making it receive the expading size of each direction separately,
+//   i.e. nodesFromRect(x, y, topSize, rightSize, bottomSize, leftSize);
+PassRefPtr<NodeList> Document::nodesFromRect(int centerX, int centerY, unsigned topPadding, unsigned rightPadding, unsigned bottomPadding, unsigned leftPadding, bool ignoreClipping) const
+{
+    // FIXME: Share code between this, elementFromPoint and caretRangeFromPoint.
+    if (!renderer())
+        return 0;
+    Frame* frame = this->frame();
+    if (!frame)
+        return 0;
+    FrameView* frameView = frame->view();
+    if (!frameView)
+        return 0;
+
+    float zoomFactor = frame->pageZoomFactor();
+    IntPoint point = roundedIntPoint(FloatPoint(centerX * zoomFactor + view()->scrollX(), centerY * zoomFactor + view()->scrollY()));
+
+    int type = HitTestRequest::ReadOnly | HitTestRequest::Active;
+
+    // When ignoreClipping is false, this method returns null for coordinates outside of the viewport.
+    if (ignoreClipping)
+        type |= HitTestRequest::IgnoreClipping;
+    else if (!frameView->visibleContentRect().intersects(HitTestResult::rectForPoint(point, topPadding, rightPadding, bottomPadding, leftPadding)))
+        return 0;
+
+    HitTestRequest request(type);
+
+    // Passing a zero padding will trigger a rect hit test, however for the purposes of nodesFromRect,
+    // we special handle this case in order to return a valid NodeList.
+    if (!topPadding && !rightPadding && !bottomPadding && !leftPadding) {
+        HitTestResult result(point);
+        return handleZeroPadding(request, result);
+    }
+
+    HitTestResult result(point, topPadding, rightPadding, bottomPadding, leftPadding);
+    renderView()->layer()->hitTest(request, result);
+
+    return StaticHashSetNodeList::adopt(result.rectBasedTestResult());
+}
+
+PassRefPtr<NodeList> Document::handleZeroPadding(const HitTestRequest& request, HitTestResult& result) const
+{
+    renderView()->layer()->hitTest(request, result);
+
+    Node* node = result.innerNode();
+    if (!node)
+        return 0;
+
+    node = node->shadowAncestorNode();
+    ListHashSet<RefPtr<Node> > list;
+    list.add(node);
+    return StaticHashSetNodeList::adopt(list);
+}
+
+Element* Document::elementFromPoint(int x, int y) const
+{
+    // FIXME: Share code between this and caretRangeFromPoint.
+    if (!renderer())
+        return 0;
+    Frame* frame = this->frame();
+    if (!frame)
+        return 0;
+    FrameView* frameView = frame->view();
+    if (!frameView)
+        return 0;
+
+    float zoomFactor = frame->pageZoomFactor();
+    IntPoint point = roundedIntPoint(FloatPoint(x * zoomFactor  + view()->scrollX(), y * zoomFactor + view()->scrollY()));
+
+    if (!frameView->visibleContentRect().contains(point))
+        return 0;
+
+    HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
+    HitTestResult result(point);
+    renderView()->layer()->hitTest(request, result);
+
+    Node* n = result.innerNode();
+    while (n && !n->isElementNode())
+        n = n->parentNode();
+    if (n)
+        n = n->shadowAncestorNode();
+    return static_cast<Element*>(n);
+}
+
+PassRefPtr<Range> Document::caretRangeFromPoint(int x, int y)
+{
+    // FIXME: Share code between this and elementFromPoint.
+    if (!renderer())
+        return 0;
+    Frame* frame = this->frame();
+    if (!frame)
+        return 0;
+    FrameView* frameView = frame->view();
+    if (!frameView)
+        return 0;
+
+    float zoomFactor = frame->pageZoomFactor();
+    IntPoint point = roundedIntPoint(FloatPoint(x * zoomFactor + view()->scrollX(), y * zoomFactor + view()->scrollY()));
+
+    if (!frameView->visibleContentRect().contains(point))
+        return 0;
+
+    HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
+    HitTestResult result(point);
+    renderView()->layer()->hitTest(request, result);
+
+    Node* node = result.innerNode();
+    if (!node)
+        return 0;
+
+    Node* shadowAncestorNode = node->shadowAncestorNode();
+    if (shadowAncestorNode != node) {
+        unsigned offset = shadowAncestorNode->nodeIndex();
+        ContainerNode* container = shadowAncestorNode->parentNode();
+        return Range::create(this, container, offset, container, offset);
+    }
+
+    RenderObject* renderer = node->renderer();
+    if (!renderer)
+        return 0;
+    VisiblePosition visiblePosition = renderer->positionForPoint(result.localPoint());
+    if (visiblePosition.isNull())
+        return 0;
+
+    Position rangeCompliantPosition = rangeCompliantEquivalent(visiblePosition);
+    return Range::create(this, rangeCompliantPosition, rangeCompliantPosition);
+}
+
+void Document::addElementById(const AtomicString& elementId, Element* element)
+{
+    m_elementsById.add(elementId.impl(), element);
+}
+
+void Document::removeElementById(const AtomicString& elementId, Element* element)
+{
+    m_elementsById.remove(elementId.impl(), element);
+}
+
+Element* Document::getElementByAccessKey(const String& key) const
+{
+    if (key.isEmpty())
+        return 0;
+    if (!m_accessKeyMapValid) {
+        for (Node* n = firstChild(); n; n = n->traverseNextNode()) {
+            if (!n->isElementNode())
+                continue;
+            Element* element = static_cast<Element*>(n);
+            const AtomicString& accessKey = element->getAttribute(accesskeyAttr);
+            if (!accessKey.isEmpty())
+                m_elementsByAccessKey.set(accessKey.impl(), element);
+        }
+        m_accessKeyMapValid = true;
+    }
+    return m_elementsByAccessKey.get(key.impl());
+}
+
+/*
+ * Performs three operations:
+ *  1. Convert control characters to spaces
+ *  2. Trim leading and trailing spaces
+ *  3. Collapse internal whitespace.
+ */
+static inline String canonicalizedTitle(Document* document, const String& title)
+{
+    const UChar* characters = title.characters();
+    unsigned length = title.length();
+    unsigned i;
+
+    StringBuffer buffer(length);
+    unsigned builderIndex = 0;
+
+    // Skip leading spaces and leading characters that would convert to spaces
+    for (i = 0; i < length; ++i) {
+        UChar c = characters[i];
+        if (!(c <= 0x20 || c == 0x7F))
+            break;
+    }
+
+    if (i == length)
+        return "";
+
+    // Replace control characters with spaces, and backslashes with currency symbols, and collapse whitespace.
+    bool previousCharWasWS = false;
+    for (; i < length; ++i) {
+        UChar c = characters[i];
+        if (c <= 0x20 || c == 0x7F || (WTF::Unicode::category(c) & (WTF::Unicode::Separator_Line | WTF::Unicode::Separator_Paragraph))) {
+            if (previousCharWasWS)
+                continue;
+            buffer[builderIndex++] = ' ';
+            previousCharWasWS = true;
+        } else {
+            buffer[builderIndex++] = c;
+            previousCharWasWS = false;
+        }
+    }
+
+    // Strip trailing spaces
+    while (builderIndex > 0) {
+        --builderIndex;
+        if (buffer[builderIndex] != ' ')
+            break;
+    }
+
+    if (!builderIndex && buffer[builderIndex] == ' ')
+        return "";
+
+    buffer.shrink(builderIndex + 1);
+
+    // Replace the backslashes with currency symbols if the encoding requires it.
+    document->displayBufferModifiedByEncoding(buffer.characters(), buffer.length());
+    
+    return String::adopt(buffer);
+}
+
+void Document::updateTitle()
+{
+    m_title = canonicalizedTitle(this, m_rawTitle);
+    if (Frame* f = frame())
+        f->loader()->setTitle(m_title);
+}
+
+void Document::setTitle(const String& title, Element* titleElement)
+{
+    if (!titleElement) {
+        // Title set by JavaScript -- overrides any title elements.
+        m_titleSetExplicitly = true;
+        if (!isHTMLDocument())
+            m_titleElement = 0;
+        else if (!m_titleElement) {
+            if (HTMLElement* headElement = head()) {
+                m_titleElement = createElement(titleTag, false);
+                ExceptionCode ec = 0;
+                headElement->appendChild(m_titleElement, ec);
+                ASSERT(!ec);
+            }
+        }
+    } else if (titleElement != m_titleElement) {
+        if (m_titleElement || m_titleSetExplicitly)
+            // Only allow the first title element to change the title -- others have no effect.
+            return;
+        m_titleElement = titleElement;
+    }
+
+    if (m_rawTitle == title)
+        return;
+
+    m_rawTitle = title;
+    updateTitle();
+
+    if (m_titleSetExplicitly && m_titleElement && m_titleElement->hasTagName(titleTag) && !titleElement)
+        static_cast<HTMLTitleElement*>(m_titleElement.get())->setText(m_title);
+}
+
+void Document::removeTitle(Element* titleElement)
+{
+    if (m_titleElement != titleElement)
+        return;
+
+    m_titleElement = 0;
+    m_titleSetExplicitly = false;
+
+    // Update title based on first title element in the head, if one exists.
+    if (HTMLElement* headElement = head()) {
+        for (Node* e = headElement->firstChild(); e; e = e->nextSibling())
+            if (e->hasTagName(titleTag)) {
+                HTMLTitleElement* titleElement = static_cast<HTMLTitleElement*>(e);
+                setTitle(titleElement->text(), titleElement);
+                break;
+            }
+    }
+
+    if (!m_titleElement && !m_rawTitle.isEmpty()) {
+        m_rawTitle = "";
+        updateTitle();
+    }
+}
+
+String Document::nodeName() const
+{
+    return "#document";
+}
+
+Node::NodeType Document::nodeType() const
+{
+    return DOCUMENT_NODE;
+}
+
+FrameView* Document::view() const
+{
+    return m_frame ? m_frame->view() : 0;
+}
+
+Page* Document::page() const
+{
+    return m_frame ? m_frame->page() : 0;    
+}
+
+Settings* Document::settings() const
+{
+    return m_frame ? m_frame->settings() : 0;
+}
+
+PassRefPtr<Range> Document::createRange()
+{
+    return Range::create(this);
+}
+
+PassRefPtr<NodeIterator> Document::createNodeIterator(Node* root, unsigned whatToShow, 
+    PassRefPtr<NodeFilter> filter, bool expandEntityReferences, ExceptionCode& ec)
+{
+    if (!root) {
+        ec = NOT_SUPPORTED_ERR;
+        return 0;
+    }
+    return NodeIterator::create(root, whatToShow, filter, expandEntityReferences);
+}
+
+PassRefPtr<TreeWalker> Document::createTreeWalker(Node* root, unsigned whatToShow, 
+    PassRefPtr<NodeFilter> filter, bool expandEntityReferences, ExceptionCode& ec)
+{
+    if (!root) {
+        ec = NOT_SUPPORTED_ERR;
+        return 0;
+    }
+    return TreeWalker::create(root, whatToShow, filter, expandEntityReferences);
+}
+
+void Document::scheduleForcedStyleRecalc()
+{
+    m_pendingStyleRecalcShouldForce = true;
+    scheduleStyleRecalc();
+}
+
+void Document::scheduleStyleRecalc()
+{
+    if (m_styleRecalcTimer.isActive() || inPageCache())
+        return;
+
+    ASSERT(childNeedsStyleRecalc() || m_pendingStyleRecalcShouldForce);
+
+    if (!documentsThatNeedStyleRecalc)
+        documentsThatNeedStyleRecalc = new HashSet<Document*>;
+    documentsThatNeedStyleRecalc->add(this);
+    
+    // FIXME: Why on earth is this here? This is clearly misplaced.
+    if (m_accessKeyMapValid) {
+        m_accessKeyMapValid = false;
+        m_elementsByAccessKey.clear();
+    }
+    
+    m_styleRecalcTimer.startOneShot(0);
+}
+
+void Document::unscheduleStyleRecalc()
+{
+    ASSERT(!childNeedsStyleRecalc());
+
+    if (documentsThatNeedStyleRecalc)
+        documentsThatNeedStyleRecalc->remove(this);
+
+    m_styleRecalcTimer.stop();
+    m_pendingStyleRecalcShouldForce = false;
+}
+
+bool Document::isPendingStyleRecalc() const
+{
+    return m_styleRecalcTimer.isActive() && !m_inStyleRecalc;
+}
+
+void Document::styleRecalcTimerFired(Timer<Document>*)
+{
+    updateStyleIfNeeded();
+}
+
+bool Document::childNeedsAndNotInStyleRecalc()
+{
+    return childNeedsStyleRecalc() && !m_inStyleRecalc;
+}
+
+void Document::recalcStyle(StyleChange change)
+{
+    // we should not enter style recalc while painting
+    if (view() && view()->isPainting()) {
+        ASSERT(!view()->isPainting());
+        return;
+    }
+    
+    if (m_inStyleRecalc)
+        return; // Guard against re-entrancy. -dwh
+
+    InspectorInstrumentationCookie cookie = InspectorInstrumentation::willRecalculateStyle(this);
+
+    m_inStyleRecalc = true;
+    suspendPostAttachCallbacks();
+    RenderWidget::suspendWidgetHierarchyUpdates();
+    if (view())
+        view()->pauseScheduledEvents();
+    
+#ifdef ANDROID_INSTRUMENT
+    android::TimeCounter::start(android::TimeCounter::CalculateStyleTimeCounter);
+#endif
+    
+    ASSERT(!renderer() || renderArena());
+    if (!renderer() || !renderArena())
+        goto bail_out;
+    
+    if (m_pendingStyleRecalcShouldForce)
+        change = Force;
+
+    if (change == Force) {
+        // style selector may set this again during recalc
+        m_hasNodesWithPlaceholderStyle = false;
+        
+        RefPtr<RenderStyle> documentStyle = CSSStyleSelector::styleForDocument(this);
+        StyleChange ch = diff(documentStyle.get(), renderer()->style());
+        if (renderer() && ch != NoChange)
+            renderer()->setStyle(documentStyle.release());
+    }
+
+    for (Node* n = firstChild(); n; n = n->nextSibling())
+        if (change >= Inherit || n->childNeedsStyleRecalc() || n->needsStyleRecalc())
+            n->recalcStyle(change);
+
+#ifdef ANDROID_INSTRUMENT
+    android::TimeCounter::record(android::TimeCounter::CalculateStyleTimeCounter, __FUNCTION__);
+#endif
+
+#if USE(ACCELERATED_COMPOSITING)
+    if (view()) {
+        bool layoutPending = view()->layoutPending() || renderer()->needsLayout();
+        // If we didn't update compositing layers because of layout(), we need to do so here.
+        if (!layoutPending)
+            view()->updateCompositingLayers();
+    }
+#endif
+
+bail_out:
+    clearNeedsStyleRecalc();
+    clearChildNeedsStyleRecalc();
+    unscheduleStyleRecalc();
+
+    if (view())
+        view()->resumeScheduledEvents();
+    RenderWidget::resumeWidgetHierarchyUpdates();
+    resumePostAttachCallbacks();
+    m_inStyleRecalc = false;
+
+    // If we wanted to call implicitClose() during recalcStyle, do so now that we're finished.
+    if (m_closeAfterStyleRecalc) {
+        m_closeAfterStyleRecalc = false;
+        implicitClose();
+    }
+
+    InspectorInstrumentation::didRecalculateStyle(cookie);
+}
+
+void Document::updateStyleIfNeeded()
+{
+    ASSERT(isMainThread());
+    ASSERT(!view() || (!view()->isInLayout() && !view()->isPainting()));
+    
+    if ((!m_pendingStyleRecalcShouldForce && !childNeedsStyleRecalc()) || inPageCache())
+        return;
+
+    if (m_frame)
+        m_frame->animation()->beginAnimationUpdate();
+        
+    recalcStyle(NoChange);
+
+    // Tell the animation controller that updateStyleIfNeeded is finished and it can do any post-processing
+    if (m_frame)
+        m_frame->animation()->endAnimationUpdate();
+}
+
+void Document::updateStyleForAllDocuments()
+{
+    ASSERT(isMainThread());
+    if (!documentsThatNeedStyleRecalc)
+        return;
+
+    while (documentsThatNeedStyleRecalc->size()) {
+        HashSet<Document*>::iterator it = documentsThatNeedStyleRecalc->begin();
+        Document* doc = *it;
+        documentsThatNeedStyleRecalc->remove(doc);
+        doc->updateStyleIfNeeded();
+    }
+}
+
+void Document::updateLayout()
+{
+    ASSERT(isMainThread());
+    if (Element* oe = ownerElement())
+        oe->document()->updateLayout();
+
+    updateStyleIfNeeded();
+
+    // Only do a layout if changes have occurred that make it necessary.      
+    FrameView* v = view();
+    if (v && renderer() && (v->layoutPending() || renderer()->needsLayout()))
+        v->layout();
+}
+
+// FIXME: This is a bad idea and needs to be removed eventually.
+// Other browsers load stylesheets before they continue parsing the web page.
+// Since we don't, we can run JavaScript code that needs answers before the
+// stylesheets are loaded. Doing a layout ignoring the pending stylesheets
+// lets us get reasonable answers. The long term solution to this problem is
+// to instead suspend JavaScript execution.
+void Document::updateLayoutIgnorePendingStylesheets()
+{
+    bool oldIgnore = m_ignorePendingStylesheets;
+    
+    if (!haveStylesheetsLoaded()) {
+        m_ignorePendingStylesheets = true;
+        // FIXME: We are willing to attempt to suppress painting with outdated style info only once.  Our assumption is that it would be
+        // dangerous to try to stop it a second time, after page content has already been loaded and displayed
+        // with accurate style information.  (Our suppression involves blanking the whole page at the
+        // moment.  If it were more refined, we might be able to do something better.)
+        // It's worth noting though that this entire method is a hack, since what we really want to do is
+        // suspend JS instead of doing a layout with inaccurate information.
+        if (body() && !body()->renderer() && m_pendingSheetLayout == NoLayoutWithPendingSheets) {
+            m_pendingSheetLayout = DidLayoutWithPendingSheets;
+            styleSelectorChanged(RecalcStyleImmediately);
+        } else if (m_hasNodesWithPlaceholderStyle)
+            // If new nodes have been added or style recalc has been done with style sheets still pending, some nodes 
+            // may not have had their real style calculated yet. Normally this gets cleaned when style sheets arrive 
+            // but here we need up-to-date style immediately.
+            recalcStyle(Force);
+    }
+
+    updateLayout();
+
+    m_ignorePendingStylesheets = oldIgnore;
+}
+
+PassRefPtr<RenderStyle> Document::styleForElementIgnoringPendingStylesheets(Element* element)
+{
+    ASSERT_ARG(element, element->document() == this);
+
+    bool oldIgnore = m_ignorePendingStylesheets;
+    m_ignorePendingStylesheets = true;
+    RefPtr<RenderStyle> style = styleSelector()->styleForElement(element, element->parentNode() ? element->parentNode()->computedStyle() : 0);
+    m_ignorePendingStylesheets = oldIgnore;
+    return style.release();
+}
+
+PassRefPtr<RenderStyle> Document::styleForPage(int pageIndex)
+{
+    RefPtr<RenderStyle> style = styleSelector()->styleForPage(pageIndex);
+    return style.release();
+}
+
+bool Document::isPageBoxVisible(int pageIndex)
+{
+    RefPtr<RenderStyle> style = styleForPage(pageIndex);
+    return style->visibility() != HIDDEN; // display property doesn't apply to @page.
+}
+
+void Document::pageSizeAndMarginsInPixels(int pageIndex, IntSize& pageSize, int& marginTop, int& marginRight, int& marginBottom, int& marginLeft)
+{
+    RefPtr<RenderStyle> style = styleForPage(pageIndex);
+
+    int width = pageSize.width();
+    int height = pageSize.height();
+    switch (style->pageSizeType()) {
+    case PAGE_SIZE_AUTO:
+        break;
+    case PAGE_SIZE_AUTO_LANDSCAPE:
+        if (width < height)
+            std::swap(width, height);
+        break;
+    case PAGE_SIZE_AUTO_PORTRAIT:
+        if (width > height)
+            std::swap(width, height);
+        break;
+    case PAGE_SIZE_RESOLVED: {
+        LengthSize size = style->pageSize();
+        ASSERT(size.width().isFixed());
+        ASSERT(size.height().isFixed());
+        width = size.width().calcValue(0);
+        height = size.height().calcValue(0);
+        break;
+    }
+    default:
+        ASSERT_NOT_REACHED();
+    }
+    pageSize = IntSize(width, height);
+
+    // The percentage is calculated with respect to the width even for margin top and bottom.
+    // http://www.w3.org/TR/CSS2/box.html#margin-properties
+    marginTop = style->marginTop().isAuto() ? marginTop : style->marginTop().calcValue(width);
+    marginRight = style->marginRight().isAuto() ? marginRight : style->marginRight().calcValue(width);
+    marginBottom = style->marginBottom().isAuto() ? marginBottom : style->marginBottom().calcValue(width);
+    marginLeft = style->marginLeft().isAuto() ? marginLeft : style->marginLeft().calcValue(width);
+}
+
+void Document::createStyleSelector()
+{
+    bool matchAuthorAndUserStyles = true;
+    if (Settings* docSettings = settings())
+        matchAuthorAndUserStyles = docSettings->authorAndUserStylesEnabled();
+    m_styleSelector.set(new CSSStyleSelector(this, m_styleSheets.get(), m_mappedElementSheet.get(), pageUserSheet(), pageGroupUserSheets(), 
+                                             !inQuirksMode(), matchAuthorAndUserStyles));
+}
+
+void Document::attach()
+{
+    ASSERT(!attached());
+    ASSERT(!m_inPageCache);
+#if !PLATFORM(ANDROID)    
+    ASSERT(!m_axObjectCache);
+#endif
+
+    if (!m_renderArena)
+        m_renderArena = new RenderArena();
+    
+    // Create the rendering tree
+    setRenderer(new (m_renderArena.get()) RenderView(this, view()));
+#if USE(ACCELERATED_COMPOSITING)
+    renderView()->didMoveOnscreen();
+#endif
+
+    recalcStyle(Force);
+
+    RenderObject* render = renderer();
+    setRenderer(0);
+
+    ContainerNode::attach();
+
+    setRenderer(render);
+}
+
+void Document::detach()
+{
+    ASSERT(attached());
+    ASSERT(!m_inPageCache);
+
+    clearAXObjectCache();
+    stopActiveDOMObjects();
+    
+    RenderObject* render = renderer();
+
+    // Send out documentWillBecomeInactive() notifications to registered elements,
+    // in order to stop media elements
+    documentWillBecomeInactive();
+
+#if ENABLE(SHARED_WORKERS)
+    SharedWorkerRepository::documentDetached(this);
+#endif
+
+    if (m_frame) {
+        FrameView* view = m_frame->view();
+        if (view)
+            view->detachCustomScrollbars();
+    }
+
+    // indicate destruction mode,  i.e. attached() but renderer == 0
+    setRenderer(0);
+    
+#if ENABLE(FULLSCREEN_API)
+    if (m_fullScreenRenderer)
+        setFullScreenRenderer(0);
+#endif
+
+    m_hoverNode = 0;
+    m_focusedNode = 0;
+    m_activeNode = 0;
+
+    ContainerNode::detach();
+
+    unscheduleStyleRecalc();
+
+    if (render)
+        render->destroy();
+    
+    // This is required, as our Frame might delete itself as soon as it detaches
+    // us. However, this violates Node::detach() semantics, as it's never
+    // possible to re-attach. Eventually Document::detach() should be renamed,
+    // or this setting of the frame to 0 could be made explicit in each of the
+    // callers of Document::detach().
+    m_frame = 0;
+    m_renderArena.clear();
+}
+
+void Document::removeAllEventListeners()
+{
+#if ENABLE(TOUCH_EVENTS)
+    Page* ownerPage = page();
+    if (!m_inPageCache && ownerPage && (m_frame == ownerPage->mainFrame()) && hasListenerType(Document::TOUCH_LISTENER)) {
+        // Inform the Chrome Client that it no longer needs to forward touch
+        // events to WebCore as the document removes all the event listeners.
+        ownerPage->chrome()->client()->needTouchEvents(false);
+    }
+#endif
+
+    EventTarget::removeAllEventListeners();
+
+    if (DOMWindow* domWindow = this->domWindow())
+        domWindow->removeAllEventListeners();
+    for (Node* node = firstChild(); node; node = node->traverseNextNode())
+        node->removeAllEventListeners();
+}
+
+RenderView* Document::renderView() const
+{
+    return toRenderView(renderer());
+}
+
+void Document::clearAXObjectCache()
+{
+#if PLATFORM(ANDROID)
+    return;
+#else
+    // clear cache in top document
+    if (m_axObjectCache) {
+        // Clear the cache member variable before calling delete because attempts
+        // are made to access it during destruction.
+        AXObjectCache* axObjectCache = m_axObjectCache;
+        m_axObjectCache = 0;
+        delete axObjectCache;
+        return;
+    }
+    
+    // ask the top-level document to clear its cache
+    Document* doc = topDocument();
+    if (doc != this)
+        doc->clearAXObjectCache();
+#endif
+}
+
+bool Document::axObjectCacheExists() const
+{
+#if PLATFORM(ANDROID)
+    return false;
+#else
+    if (m_axObjectCache)
+        return true;
+    
+    Document* doc = topDocument();
+    if (doc != this)
+        return doc->axObjectCacheExists();
+    
+    return false;
+#endif
+}
+    
+AXObjectCache* Document::axObjectCache() const
+{
+#if PLATFORM(ANDROID)
+    return 0;
+#else
+    // The only document that actually has a AXObjectCache is the top-level
+    // document.  This is because we need to be able to get from any WebCoreAXObject
+    // to any other WebCoreAXObject on the same page.  Using a single cache allows
+    // lookups across nested webareas (i.e. multiple documents).
+    
+    if (m_axObjectCache) {
+        // return already known top-level cache
+        if (!ownerElement())
+            return m_axObjectCache;
+        
+        // In some pages with frames, the cache is created before the sub-webarea is
+        // inserted into the tree.  Here, we catch that case and just toss the old
+        // cache and start over.
+        // NOTE: This recovery may no longer be needed. I have been unable to trigger
+        // it again. See rdar://5794454
+        // FIXME: Can this be fixed when inserting the subframe instead of now?
+        // FIXME: If this function was called to get the cache in order to remove
+        // an AXObject, we are now deleting the cache as a whole and returning a
+        // new empty cache that does not contain the AXObject! That should actually
+        // be OK. I am concerned about other cases like this where accessing the
+        // cache blows away the AXObject being operated on.
+        delete m_axObjectCache;
+        m_axObjectCache = 0;
+    }
+
+    // ask the top-level document for its cache
+    Document* doc = topDocument();
+    if (doc != this)
+        return doc->axObjectCache();
+    
+    // this is the top-level document, so install a new cache
+    m_axObjectCache = new AXObjectCache(this);
+    return m_axObjectCache;
+#endif // ANDROID
+}
+
+void Document::setVisuallyOrdered()
+{
+    m_visuallyOrdered = true;
+    if (renderer())
+        renderer()->style()->setVisuallyOrdered(true);
+}
+
+PassRefPtr<DocumentParser> Document::createParser()
+{
+    // FIXME: this should probably pass the frame instead
+    return XMLDocumentParser::create(this, view());
+}
+
+ScriptableDocumentParser* Document::scriptableDocumentParser() const
+{
+    return parser() ? parser()->asScriptableDocumentParser() : 0;
+}
+
+void Document::open(Document* ownerDocument)
+{
+    if (ownerDocument) {
+        setURL(ownerDocument->url());
+        m_cookieURL = ownerDocument->cookieURL();
+        ScriptExecutionContext::setSecurityOrigin(ownerDocument->securityOrigin());
+    }
+
+    if (m_frame) {
+        ScriptableDocumentParser* parser = scriptableDocumentParser();
+        if (m_frame->loader()->isLoadingMainResource() || (parser && parser->isParsing() && parser->isExecutingScript()))
+            return;
+
+        if (m_frame->loader()->state() == FrameStateProvisional)
+            m_frame->loader()->stopAllLoaders();
+    }
+
+    removeAllEventListeners();
+    implicitOpen();
+
+    if (DOMWindow* domWindow = this->domWindow())
+        domWindow->removeAllEventListeners();
+
+    if (m_frame)
+        m_frame->loader()->didExplicitOpen();
+}
+
+void Document::detachParser()
+{
+    if (!m_parser)
+        return;
+    m_parser->detach();
+    m_parser.clear();
+}
+
+void Document::cancelParsing()
+{
+    if (m_parser) {
+        // We have to clear the parser to avoid possibly triggering
+        // the onload handler when closing as a side effect of a cancel-style
+        // change, such as opening a new document or closing the window while
+        // still parsing
+        detachParser();
+        close();
+    }
+}
+
+void Document::implicitOpen()
+{
+    cancelParsing();
+
+    removeChildren();
+
+    setCompatibilityMode(NoQuirksMode);
+
+    m_parser = createParser();
+    setParsing(true);
+    setReadyState(Loading);
+
+    ScriptableDocumentParser* parser = scriptableDocumentParser();
+    if (m_frame && parser)
+        parser->setXSSAuditor(m_frame->script()->xssAuditor());
+
+    // If we reload, the animation controller sticks around and has
+    // a stale animation time. We need to update it here.
+    if (m_frame && m_frame->animation())
+        m_frame->animation()->beginAnimationUpdate();
+}
+
+HTMLElement* Document::body() const
+{
+    Node* de = documentElement();
+    if (!de)
+        return 0;
+    
+    // try to prefer a FRAMESET element over BODY
+    Node* body = 0;
+    for (Node* i = de->firstChild(); i; i = i->nextSibling()) {
+        if (i->hasTagName(framesetTag))
+            return static_cast<HTMLElement*>(i);
+        
+        if (i->hasTagName(bodyTag) && !body)
+            body = i;
+    }
+    return static_cast<HTMLElement*>(body);
+}
+
+void Document::setBody(PassRefPtr<HTMLElement> newBody, ExceptionCode& ec)
+{
+    if (!newBody || !documentElement()) { 
+        ec = HIERARCHY_REQUEST_ERR;
+        return;
+    }
+
+    HTMLElement* b = body();
+    if (!b)
+        documentElement()->appendChild(newBody, ec);
+    else
+        documentElement()->replaceChild(newBody, b, ec);
+}
+
+HTMLHeadElement* Document::head()
+{
+    Node* de = documentElement();
+    if (!de)
+        return 0;
+
+    for (Node* e = de->firstChild(); e; e = e->nextSibling())
+        if (e->hasTagName(headTag))
+            return static_cast<HTMLHeadElement*>(e);
+
+    return 0;
+}
+
+void Document::close()
+{
+    Frame* frame = this->frame();
+    if (frame) {
+        // This code calls implicitClose() if all loading has completed.
+        FrameLoader* frameLoader = frame->loader();
+        frameLoader->writer()->endIfNotLoadingMainResource();
+        frameLoader->checkCompleted();
+    } else {
+        // Because we have no frame, we don't know if all loading has completed,
+        // so we just call implicitClose() immediately. FIXME: This might fire
+        // the load event prematurely <http://bugs.webkit.org/show_bug.cgi?id=14568>.
+        implicitClose();
+    }
+}
+
+void Document::implicitClose()
+{
+    // If we're in the middle of recalcStyle, we need to defer the close until the style information is accurate and all elements are re-attached.
+    if (m_inStyleRecalc) {
+        m_closeAfterStyleRecalc = true;
+        return;
+    }
+
+    bool wasLocationChangePending = frame() && frame()->navigationScheduler()->locationChangePending();
+    bool doload = !parsing() && m_parser && !m_processingLoadEvent && !wasLocationChangePending;
+    
+    if (!doload)
+        return;
+
+    m_processingLoadEvent = true;
+
+    ScriptableDocumentParser* parser = scriptableDocumentParser();
+    m_wellFormed = parser && parser->wellFormed();
+
+    // We have to clear the parser, in case someone document.write()s from the
+    // onLoad event handler, as in Radar 3206524.
+    detachParser();
+
+    // Parser should have picked up all preloads by now
+    m_cachedResourceLoader->clearPreloads();
+
+    // FIXME: We kick off the icon loader when the Document is done parsing.
+    // There are earlier opportunities we could start it:
+    //  -When the <head> finishes parsing
+    //  -When any new HTMLLinkElement is inserted into the document
+    // But those add a dynamic component to the favicon that has UI 
+    // ramifications, and we need to decide what is the Right Thing To Do(tm)
+    Frame* f = frame();
+    if (f)
+        f->loader()->startIconLoader();
+
+    // Resume the animations (or start them)
+    if (f)
+        f->animation()->resumeAnimationsForDocument(this);
+
+    ImageLoader::dispatchPendingBeforeLoadEvents();
+    ImageLoader::dispatchPendingLoadEvents();
+    dispatchWindowLoadEvent();
+    enqueuePageshowEvent(PageshowEventNotPersisted);
+    enqueuePopstateEvent(m_pendingStateObject ? m_pendingStateObject.release() : SerializedScriptValue::nullValue());
+    
+    if (f)
+        f->loader()->handledOnloadEvents();
+#ifdef INSTRUMENT_LAYOUT_SCHEDULING
+    if (!ownerElement())
+        printf("onload fired at %d\n", elapsedTime());
+#endif
+
+    m_processingLoadEvent = false;
+
+    // An event handler may have removed the frame
+    if (!frame())
+        return;
+
+    // Make sure both the initial layout and reflow happen after the onload
+    // fires. This will improve onload scores, and other browsers do it.
+    // If they wanna cheat, we can too. -dwh
+
+    if (frame()->navigationScheduler()->locationChangePending() && elapsedTime() < cLayoutScheduleThreshold) {
+        // Just bail out. Before or during the onload we were shifted to another page.
+        // The old i-Bench suite does this. When this happens don't bother painting or laying out.        
+        view()->unscheduleRelayout();
+        return;
+    }
+
+    frame()->loader()->checkCallImplicitClose();
+    RenderObject* renderObject = renderer();
+    
+    // We used to force a synchronous display and flush here.  This really isn't
+    // necessary and can in fact be actively harmful if pages are loading at a rate of > 60fps
+    // (if your platform is syncing flushes and limiting them to 60fps).
+    m_overMinimumLayoutThreshold = true;
+    if (!ownerElement() || (ownerElement()->renderer() && !ownerElement()->renderer()->needsLayout())) {
+        updateStyleIfNeeded();
+        
+        // Always do a layout after loading if needed.
+        if (view() && renderObject && (!renderObject->firstChild() || renderObject->needsLayout()))
+            view()->layout();
+    }
+
+#if PLATFORM(MAC) || PLATFORM(CHROMIUM)
+    if (f && renderObject && this == topDocument() && AXObjectCache::accessibilityEnabled()) {
+        // The AX cache may have been cleared at this point, but we need to make sure it contains an
+        // AX object to send the notification to. getOrCreate will make sure that an valid AX object
+        // exists in the cache (we ignore the return value because we don't need it here). This is 
+        // only safe to call when a layout is not in progress, so it can not be used in postNotification.    
+        axObjectCache()->getOrCreate(renderObject);
+        axObjectCache()->postNotification(renderObject, AXObjectCache::AXLoadComplete, true);
+    }
+#endif
+
+#if ENABLE(SVG)
+    // FIXME: Officially, time 0 is when the outermost <svg> receives its
+    // SVGLoad event, but we don't implement those yet.  This is close enough
+    // for now.  In some cases we should have fired earlier.
+    if (svgExtensions())
+        accessSVGExtensions()->startAnimations();
+#endif
+}
+
+void Document::setParsing(bool b)
+{
+    m_bParsing = b;
+    if (!m_bParsing && view())
+        view()->scheduleRelayout();
+
+#ifdef INSTRUMENT_LAYOUT_SCHEDULING
+    if (!ownerElement() && !m_bParsing)
+        printf("Parsing finished at %d\n", elapsedTime());
+#endif
+}
+
+bool Document::shouldScheduleLayout()
+{
+    // This function will only be called when FrameView thinks a layout is needed.
+    // This enforces a couple extra rules.
+    //
+    //    (a) Only schedule a layout once the stylesheets are loaded.
+    //    (b) Only schedule layout once we have a body element.
+
+    return (haveStylesheetsLoaded() && body())
+        || (documentElement() && !documentElement()->hasTagName(htmlTag));
+}
+
+int Document::minimumLayoutDelay()
+{
+    if (m_overMinimumLayoutThreshold)
+        return m_extraLayoutDelay;
+    
+    int elapsed = elapsedTime();
+    m_overMinimumLayoutThreshold = elapsed > cLayoutScheduleThreshold;
+    
+    // We'll want to schedule the timer to fire at the minimum layout threshold.
+    return max(0, cLayoutScheduleThreshold - elapsed) + m_extraLayoutDelay;
+}
+
+int Document::elapsedTime() const
+{
+    return static_cast<int>((currentTime() - m_startTime) * 1000);
+}
+
+void Document::write(const SegmentedString& text, Document* ownerDocument)
+{
+#ifdef INSTRUMENT_LAYOUT_SCHEDULING
+    if (!ownerElement())
+        printf("Beginning a document.write at %d\n", elapsedTime());
+#endif
+
+    bool hasInsertionPoint = m_parser && m_parser->hasInsertionPoint();
+    if (!hasInsertionPoint && m_ignoreDestructiveWriteCount)
+        return;
+
+    if (!hasInsertionPoint)
+        open(ownerDocument);
+
+    ASSERT(m_parser);
+    m_parser->insert(text);
+
+#ifdef INSTRUMENT_LAYOUT_SCHEDULING
+    if (!ownerElement())
+        printf("Ending a document.write at %d\n", elapsedTime());
+#endif    
+}
+
+void Document::write(const String& text, Document* ownerDocument)
+{
+    write(SegmentedString(text), ownerDocument);
+}
+
+void Document::writeln(const String& text, Document* ownerDocument)
+{
+    write(text, ownerDocument);
+    write("\n", ownerDocument);
+}
+
+void Document::finishParsing()
+{
+#ifdef INSTRUMENT_LAYOUT_SCHEDULING
+    if (!ownerElement())
+        printf("Received all data at %d\n", elapsedTime());
+#endif
+    
+    // Let the parser go through as much data as it can.  There will be three possible outcomes after
+    // finish() is called:
+    // (1) All remaining data is parsed, document isn't loaded yet
+    // (2) All remaining data is parsed, document is loaded, parser gets deleted
+    // (3) Data is still remaining to be parsed.
+    if (m_parser)
+        m_parser->finish();
+}
+
+const KURL& Document::virtualURL() const
+{
+    return m_url;
+}
+
+KURL Document::virtualCompleteURL(const String& url) const
+{
+    return completeURL(url);
+}
+
+void Document::setURL(const KURL& url)
+{
+    const KURL& newURL = url.isEmpty() ? blankURL() : url;
+    if (newURL == m_url)
+        return;
+
+    m_url = newURL;
+    m_documentURI = m_url.string();
+    updateBaseURL();
+}
+
+void Document::updateBaseURL()
+{
+    // DOM 3 Core: When the Document supports the feature "HTML" [DOM Level 2 HTML], the base URI is computed using
+    // first the value of the href attribute of the HTML BASE element if any, and the value of the documentURI attribute
+    // from the Document interface otherwise.
+    if (m_baseElementURL.isEmpty()) {
+        // The documentURI attribute is an arbitrary string. DOM 3 Core does not specify how it should be resolved,
+        // so we use a null base URL.
+        m_baseURL = KURL(KURL(), documentURI());
+    } else
+        m_baseURL = m_baseElementURL;
+    if (!m_baseURL.isValid())
+        m_baseURL = KURL();
+
+    if (m_elemSheet)
+        m_elemSheet->setFinalURL(m_baseURL);
+    if (m_mappedElementSheet)
+        m_mappedElementSheet->setFinalURL(m_baseURL);
+}
+
+void Document::processBaseElement()
+{
+    // Find the first href attribute in a base element and the first target attribute in a base element.
+    const AtomicString* href = 0;
+    const AtomicString* target = 0;
+    for (Node* node = document()->firstChild(); node && (!href || !target); node = node->traverseNextNode()) {
+        if (node->hasTagName(baseTag)) {
+            if (!href) {
+                const AtomicString& value = static_cast<Element*>(node)->fastGetAttribute(hrefAttr);
+                if (!value.isNull())
+                    href = &value;
+            }
+            if (!target) {
+                const AtomicString& value = static_cast<Element*>(node)->fastGetAttribute(targetAttr);
+                if (!value.isNull())
+                    target = &value;
+            }
+        }
+    }
+
+    // FIXME: Since this doesn't share code with completeURL it may not handle encodings correctly.
+    KURL baseElementURL;
+    if (href) {
+        String strippedHref = stripLeadingAndTrailingHTMLSpaces(*href);
+        if (!strippedHref.isEmpty() && (!frame() || frame()->script()->xssAuditor()->canSetBaseElementURL(*href)))
+            baseElementURL = KURL(url(), strippedHref);
+    }
+    if (m_baseElementURL != baseElementURL) {
+        m_baseElementURL = baseElementURL;
+        updateBaseURL();
+    }
+
+    m_baseTarget = target ? *target : nullAtom;
+}
+
+String Document::userAgent(const KURL& url) const
+{
+    return frame() ? frame()->loader()->userAgent(url) : String();
+}
+
+CSSStyleSheet* Document::pageUserSheet()
+{
+    if (m_pageUserSheet)
+        return m_pageUserSheet.get();
+    
+    Page* owningPage = page();
+    if (!owningPage)
+        return 0;
+    
+    String userSheetText = owningPage->userStyleSheet();
+    if (userSheetText.isEmpty())
+        return 0;
+    
+    // Parse the sheet and cache it.
+    m_pageUserSheet = CSSStyleSheet::createInline(this, settings()->userStyleSheetLocation());
+    m_pageUserSheet->setIsUserStyleSheet(true);
+    m_pageUserSheet->parseString(userSheetText, !inQuirksMode());
+    return m_pageUserSheet.get();
+}
+
+void Document::clearPageUserSheet()
+{
+    if (m_pageUserSheet) {
+        m_pageUserSheet = 0;
+        styleSelectorChanged(DeferRecalcStyle);
+    }
+}
+
+void Document::updatePageUserSheet()
+{
+    clearPageUserSheet();
+    if (pageUserSheet())
+        styleSelectorChanged(RecalcStyleImmediately);
+}
+
+const Vector<RefPtr<CSSStyleSheet> >* Document::pageGroupUserSheets() const
+{
+    if (m_pageGroupUserSheetCacheValid)
+        return m_pageGroupUserSheets.get();
+    
+    m_pageGroupUserSheetCacheValid = true;
+    
+    Page* owningPage = page();
+    if (!owningPage)
+        return 0;
+        
+    const PageGroup& pageGroup = owningPage->group();
+    const UserStyleSheetMap* sheetsMap = pageGroup.userStyleSheets();
+    if (!sheetsMap)
+        return 0;
+
+    UserStyleSheetMap::const_iterator end = sheetsMap->end();
+    for (UserStyleSheetMap::const_iterator it = sheetsMap->begin(); it != end; ++it) {
+        const UserStyleSheetVector* sheets = it->second;
+        for (unsigned i = 0; i < sheets->size(); ++i) {
+            const UserStyleSheet* sheet = sheets->at(i).get();
+            if (sheet->injectedFrames() == InjectInTopFrameOnly && ownerElement())
+                continue;
+            if (!UserContentURLPattern::matchesPatterns(url(), sheet->whitelist(), sheet->blacklist()))
+                continue;
+            RefPtr<CSSStyleSheet> parsedSheet = CSSStyleSheet::createInline(const_cast<Document*>(this), sheet->url());
+            parsedSheet->setIsUserStyleSheet(sheet->level() == UserStyleUserLevel);
+            parsedSheet->parseString(sheet->source(), !inQuirksMode());
+            if (!m_pageGroupUserSheets)
+                m_pageGroupUserSheets.set(new Vector<RefPtr<CSSStyleSheet> >);
+            m_pageGroupUserSheets->append(parsedSheet.release());
+        }
+    }
+
+    return m_pageGroupUserSheets.get();
+}
+
+void Document::clearPageGroupUserSheets()
+{
+    m_pageGroupUserSheetCacheValid = false;
+    if (m_pageGroupUserSheets && m_pageGroupUserSheets->size()) {
+        m_pageGroupUserSheets->clear();
+        styleSelectorChanged(DeferRecalcStyle);
+    }
+}
+
+void Document::updatePageGroupUserSheets()
+{
+    clearPageGroupUserSheets();
+    if (pageGroupUserSheets() && pageGroupUserSheets()->size())
+        styleSelectorChanged(RecalcStyleImmediately);
+}
+
+CSSStyleSheet* Document::elementSheet()
+{
+    if (!m_elemSheet)
+        m_elemSheet = CSSStyleSheet::createInline(this, m_baseURL);
+    return m_elemSheet.get();
+}
+
+CSSStyleSheet* Document::mappedElementSheet()
+{
+    if (!m_mappedElementSheet)
+        m_mappedElementSheet = CSSStyleSheet::createInline(this, m_baseURL);
+    return m_mappedElementSheet.get();
+}
+
+static Node* nextNodeWithExactTabIndex(Node* start, int tabIndex, KeyboardEvent* event)
+{
+    // Search is inclusive of start
+    for (Node* n = start; n; n = n->traverseNextNode())
+        if (n->isKeyboardFocusable(event) && n->tabIndex() == tabIndex)
+            return n;
+    
+    return 0;
+}
+
+static Node* previousNodeWithExactTabIndex(Node* start, int tabIndex, KeyboardEvent* event)
+{
+    // Search is inclusive of start
+    for (Node* n = start; n; n = n->traversePreviousNode())
+        if (n->isKeyboardFocusable(event) && n->tabIndex() == tabIndex)
+            return n;
+    
+    return 0;
+}
+
+static Node* nextNodeWithGreaterTabIndex(Node* start, int tabIndex, KeyboardEvent* event)
+{
+    // Search is inclusive of start
+    int winningTabIndex = SHRT_MAX + 1;
+    Node* winner = 0;
+    for (Node* n = start; n; n = n->traverseNextNode())
+        if (n->isKeyboardFocusable(event) && n->tabIndex() > tabIndex && n->tabIndex() < winningTabIndex) {
+            winner = n;
+            winningTabIndex = n->tabIndex();
+        }
+    
+    return winner;
+}
+
+static Node* previousNodeWithLowerTabIndex(Node* start, int tabIndex, KeyboardEvent* event)
+{
+    // Search is inclusive of start
+    int winningTabIndex = 0;
+    Node* winner = 0;
+    for (Node* n = start; n; n = n->traversePreviousNode())
+        if (n->isKeyboardFocusable(event) && n->tabIndex() < tabIndex && n->tabIndex() > winningTabIndex) {
+            winner = n;
+            winningTabIndex = n->tabIndex();
+        }
+    
+    return winner;
+}
+
+Node* Document::nextFocusableNode(Node* start, KeyboardEvent* event)
+{
+    if (start) {
+        // If a node is excluded from the normal tabbing cycle, the next focusable node is determined by tree order
+        if (start->tabIndex() < 0) {
+            for (Node* n = start->traverseNextNode(); n; n = n->traverseNextNode())
+                if (n->isKeyboardFocusable(event) && n->tabIndex() >= 0)
+                    return n;
+        }
+    
+        // First try to find a node with the same tabindex as start that comes after start in the document.
+        if (Node* winner = nextNodeWithExactTabIndex(start->traverseNextNode(), start->tabIndex(), event))
+            return winner;
+
+        if (!start->tabIndex())
+            // We've reached the last node in the document with a tabindex of 0. This is the end of the tabbing order.
+            return 0;
+    }
+
+    // Look for the first node in the document that:
+    // 1) has the lowest tabindex that is higher than start's tabindex (or 0, if start is null), and
+    // 2) comes first in the document, if there's a tie.
+    if (Node* winner = nextNodeWithGreaterTabIndex(this, start ? start->tabIndex() : 0, event))
+        return winner;
+
+    // There are no nodes with a tabindex greater than start's tabindex,
+    // so find the first node with a tabindex of 0.
+    return nextNodeWithExactTabIndex(this, 0, event);
+}
+
+Node* Document::previousFocusableNode(Node* start, KeyboardEvent* event)
+{
+    Node* last;
+    for (last = this; last->lastChild(); last = last->lastChild()) { }
+
+    // First try to find the last node in the document that comes before start and has the same tabindex as start.
+    // If start is null, find the last node in the document with a tabindex of 0.
+    Node* startingNode;
+    int startingTabIndex;
+    if (start) {
+        startingNode = start->traversePreviousNode();
+        startingTabIndex = start->tabIndex();
+    } else {
+        startingNode = last;
+        startingTabIndex = 0;
+    }
+    
+    // However, if a node is excluded from the normal tabbing cycle, the previous focusable node is determined by tree order
+    if (startingTabIndex < 0) {
+        for (Node* n = startingNode; n; n = n->traversePreviousNode())
+            if (n->isKeyboardFocusable(event) && n->tabIndex() >= 0)
+                return n;        
+    }
+
+    if (Node* winner = previousNodeWithExactTabIndex(startingNode, startingTabIndex, event))
+        return winner;
+
+    // There are no nodes before start with the same tabindex as start, so look for a node that:
+    // 1) has the highest non-zero tabindex (that is less than start's tabindex), and
+    // 2) comes last in the document, if there's a tie.
+    startingTabIndex = (start && start->tabIndex()) ? start->tabIndex() : SHRT_MAX;
+    return previousNodeWithLowerTabIndex(last, startingTabIndex, event);
+}
+
+int Document::nodeAbsIndex(Node *node)
+{
+    ASSERT(node->document() == this);
+
+    int absIndex = 0;
+    for (Node* n = node; n && n != this; n = n->traversePreviousNode())
+        absIndex++;
+    return absIndex;
+}
+
+Node* Document::nodeWithAbsIndex(int absIndex)
+{
+    Node* n = this;
+    for (int i = 0; n && (i < absIndex); i++)
+        n = n->traverseNextNode();
+    return n;
+}
+
+#ifdef ANDROID_META_SUPPORT
+void Document::processMetadataSettings(const String& content)
+{
+    ASSERT(!content.isNull());
+    processArguments(content, 0, 0);
+}
+#endif
+
+void Document::processHttpEquiv(const String& equiv, const String& content)
+{
+    ASSERT(!equiv.isNull() && !content.isNull());
+
+    Frame* frame = this->frame();
+
+    if (equalIgnoringCase(equiv, "default-style")) {
+        // The preferred style set has been overridden as per section 
+        // 14.3.2 of the HTML4.0 specification.  We need to update the
+        // sheet used variable and then update our style selector. 
+        // For more info, see the test at:
+        // http://www.hixie.ch/tests/evil/css/import/main/preferred.html
+        // -dwh
+        m_selectedStylesheetSet = content;
+        m_preferredStylesheetSet = content;
+        styleSelectorChanged(DeferRecalcStyle);
+    } else if (equalIgnoringCase(equiv, "refresh")) {
+        double delay;
+        String url;
+        if (frame && parseHTTPRefresh(content, true, delay, url)) {
+            if (url.isEmpty())
+                url = frame->loader()->url().string();
+            else
+                url = completeURL(url).string();
+            frame->navigationScheduler()->scheduleRedirect(delay, url);
+        }
+    } else if (equalIgnoringCase(equiv, "set-cookie")) {
+        // FIXME: make setCookie work on XML documents too; e.g. in case of <html:meta .....>
+        if (isHTMLDocument()) {
+            ExceptionCode ec; // Exception (for sandboxed documents) ignored.
+            static_cast<HTMLDocument*>(this)->setCookie(content, ec);
+        }
+    } else if (equalIgnoringCase(equiv, "content-language"))
+        setContentLanguage(content);
+    else if (equalIgnoringCase(equiv, "x-dns-prefetch-control"))
+        parseDNSPrefetchControlHeader(content);
+    else if (equalIgnoringCase(equiv, "x-frame-options")) {
+        if (frame) {
+            FrameLoader* frameLoader = frame->loader();
+            if (frameLoader->shouldInterruptLoadForXFrameOptions(content, url())) {
+                frameLoader->stopAllLoaders();
+                frame->navigationScheduler()->scheduleLocationChange(securityOrigin(), blankURL(), String());
+
+                DEFINE_STATIC_LOCAL(String, consoleMessage, ("Refused to display document because display forbidden by X-Frame-Options.\n"));
+                frame->domWindow()->console()->addMessage(JSMessageSource, LogMessageType, ErrorMessageLevel, consoleMessage, 1, String());
+            }
+        }
+    }
+}
+
+// Though isspace() considers \t and \v to be whitespace, Win IE doesn't.
+static bool isSeparator(UChar c)
+{
+    return c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '=' || c == ',' || c == '\0';
+}
+
+void Document::processArguments(const String& features, void* data, ArgumentsCallback callback)
+{
+    // Tread lightly in this code -- it was specifically designed to mimic Win IE's parsing behavior.
+    int keyBegin, keyEnd;
+    int valueBegin, valueEnd;
+
+    int i = 0;
+    int length = features.length();
+    String buffer = features.lower();
+    while (i < length) {
+        // skip to first non-separator, but don't skip past the end of the string
+        while (isSeparator(buffer[i])) {
+            if (i >= length)
+                break;
+            i++;
+        }
+        keyBegin = i;
+
+        // skip to first separator
+        while (!isSeparator(buffer[i]))
+            i++;
+        keyEnd = i;
+
+        // skip to first '=', but don't skip past a ',' or the end of the string
+        while (buffer[i] != '=') {
+            if (buffer[i] == ',' || i >= length)
+                break;
+            i++;
+        }
+
+        // skip to first non-separator, but don't skip past a ',' or the end of the string
+        while (isSeparator(buffer[i])) {
+            if (buffer[i] == ',' || i >= length)
+                break;
+            i++;
+        }
+        valueBegin = i;
+
+        // skip to first separator
+        while (!isSeparator(buffer[i]))
+            i++;
+        valueEnd = i;
+
+        ASSERT(i <= length);
+
+        String keyString = buffer.substring(keyBegin, keyEnd - keyBegin);
+        String valueString = buffer.substring(valueBegin, valueEnd - valueBegin);
+#ifdef ANDROID_META_SUPPORT
+        if (frame())
+            frame()->settings()->setMetadataSettings(keyString, valueString);
+#else
+        callback(keyString, valueString, this, data);
+#endif
+    }
+}
+
+void Document::processViewport(const String& features)
+{
+    ASSERT(!features.isNull());
+
+    m_viewportArguments = ViewportArguments();
+    processArguments(features, (void*)&m_viewportArguments, &setViewportFeature);
+
+    Frame* frame = this->frame();
+    if (!frame || !frame->page())
+        return;
+
+    frame->page()->updateViewportArguments();
+}
+
+MouseEventWithHitTestResults Document::prepareMouseEvent(const HitTestRequest& request, const IntPoint& documentPoint, const PlatformMouseEvent& event)
+{
+    ASSERT(!renderer() || renderer()->isRenderView());
+
+    if (!renderer())
+        return MouseEventWithHitTestResults(event, HitTestResult(IntPoint()));
+
+    HitTestResult result(documentPoint);
+    renderView()->layer()->hitTest(request, result);
+
+    if (!request.readOnly())
+        updateStyleIfNeeded();
+
+    return MouseEventWithHitTestResults(event, result);
+}
+
+// DOM Section 1.1.1
+bool Document::childTypeAllowed(NodeType type)
+{
+    switch (type) {
+    case ATTRIBUTE_NODE:
+    case CDATA_SECTION_NODE:
+    case DOCUMENT_FRAGMENT_NODE:
+    case DOCUMENT_NODE:
+    case ENTITY_NODE:
+    case ENTITY_REFERENCE_NODE:
+    case NOTATION_NODE:
+    case TEXT_NODE:
+    case XPATH_NAMESPACE_NODE:
+        return false;
+    case COMMENT_NODE:
+    case PROCESSING_INSTRUCTION_NODE:
+        return true;
+    case DOCUMENT_TYPE_NODE:
+    case ELEMENT_NODE:
+        // Documents may contain no more than one of each of these.
+        // (One Element and one DocumentType.)
+        for (Node* c = firstChild(); c; c = c->nextSibling())
+            if (c->nodeType() == type)
+                return false;
+        return true;
+    }
+    return false;
+}
+
+bool Document::canReplaceChild(Node* newChild, Node* oldChild)
+{
+    if (!oldChild)
+        // ContainerNode::replaceChild will raise a NOT_FOUND_ERR.
+        return true;
+
+    if (oldChild->nodeType() == newChild->nodeType())
+        return true;
+
+    int numDoctypes = 0;
+    int numElements = 0;
+
+    // First, check how many doctypes and elements we have, not counting
+    // the child we're about to remove.
+    for (Node* c = firstChild(); c; c = c->nextSibling()) {
+        if (c == oldChild)
+            continue;
+        
+        switch (c->nodeType()) {
+        case DOCUMENT_TYPE_NODE:
+            numDoctypes++;
+            break;
+        case ELEMENT_NODE:
+            numElements++;
+            break;
+        default:
+            break;
+        }
+    }
+    
+    // Then, see how many doctypes and elements might be added by the new child.
+    if (newChild->nodeType() == DOCUMENT_FRAGMENT_NODE) {
+        for (Node* c = firstChild(); c; c = c->nextSibling()) {
+            switch (c->nodeType()) {
+            case ATTRIBUTE_NODE:
+            case CDATA_SECTION_NODE:
+            case DOCUMENT_FRAGMENT_NODE:
+            case DOCUMENT_NODE:
+            case ENTITY_NODE:
+            case ENTITY_REFERENCE_NODE:
+            case NOTATION_NODE:
+            case TEXT_NODE:
+            case XPATH_NAMESPACE_NODE:
+                return false;
+            case COMMENT_NODE:
+            case PROCESSING_INSTRUCTION_NODE:
+                break;
+            case DOCUMENT_TYPE_NODE:
+                numDoctypes++;
+                break;
+            case ELEMENT_NODE:
+                numElements++;
+                break;
+            }
+        }
+    } else {
+        switch (newChild->nodeType()) {
+        case ATTRIBUTE_NODE:
+        case CDATA_SECTION_NODE:
+        case DOCUMENT_FRAGMENT_NODE:
+        case DOCUMENT_NODE:
+        case ENTITY_NODE:
+        case ENTITY_REFERENCE_NODE:
+        case NOTATION_NODE:
+        case TEXT_NODE:
+        case XPATH_NAMESPACE_NODE:
+            return false;
+        case COMMENT_NODE:
+        case PROCESSING_INSTRUCTION_NODE:
+            return true;
+        case DOCUMENT_TYPE_NODE:
+            numDoctypes++;
+            break;
+        case ELEMENT_NODE:
+            numElements++;
+            break;
+        }                
+    }
+        
+    if (numElements > 1 || numDoctypes > 1)
+        return false;
+    
+    return true;
+}
+
+PassRefPtr<Node> Document::cloneNode(bool /*deep*/)
+{
+    // Spec says cloning Document nodes is "implementation dependent"
+    // so we do not support it...
+    return 0;
+}
+
+StyleSheetList* Document::styleSheets()
+{
+    return m_styleSheets.get();
+}
+
+String Document::preferredStylesheetSet() const
+{
+    return m_preferredStylesheetSet;
+}
+
+String Document::selectedStylesheetSet() const
+{
+    return m_selectedStylesheetSet;
+}
+
+void Document::setSelectedStylesheetSet(const String& aString)
+{
+    m_selectedStylesheetSet = aString;
+    styleSelectorChanged(DeferRecalcStyle);
+}
+
+// This method is called whenever a top-level stylesheet has finished loading.
+void Document::removePendingSheet()
+{
+    // Make sure we knew this sheet was pending, and that our count isn't out of sync.
+    ASSERT(m_pendingStylesheets > 0);
+
+    m_pendingStylesheets--;
+    
+#ifdef INSTRUMENT_LAYOUT_SCHEDULING
+    if (!ownerElement())
+        printf("Stylesheet loaded at time %d. %d stylesheets still remain.\n", elapsedTime(), m_pendingStylesheets);
+#endif
+
+    if (m_pendingStylesheets)
+        return;
+
+    styleSelectorChanged(RecalcStyleImmediately);
+
+    ScriptableDocumentParser* parser = scriptableDocumentParser();
+    if (parser)
+        parser->executeScriptsWaitingForStylesheets();
+
+    if (m_gotoAnchorNeededAfterStylesheetsLoad && view())
+        view()->scrollToFragment(m_frame->loader()->url());
+}
+
+void Document::styleSelectorChanged(StyleSelectorUpdateFlag updateFlag)
+{
+    // Don't bother updating, since we haven't loaded all our style info yet
+    // and haven't calculated the style selector for the first time.
+    if (!attached() || (!m_didCalculateStyleSelector && !haveStylesheetsLoaded()))
+        return;
+
+#ifdef INSTRUMENT_LAYOUT_SCHEDULING
+    if (!ownerElement())
+        printf("Beginning update of style selector at time %d.\n", elapsedTime());
+#endif
+
+    recalcStyleSelector();
+    
+    if (updateFlag == DeferRecalcStyle) {
+        scheduleForcedStyleRecalc();
+        return;
+    }
+    
+    if (didLayoutWithPendingStylesheets() && m_pendingStylesheets <= 0) {
+        m_pendingSheetLayout = IgnoreLayoutWithPendingSheets;
+        if (renderer())
+            renderer()->repaint();
+    }
+
+    // This recalcStyle initiates a new recalc cycle. We need to bracket it to
+    // make sure animations get the correct update time
+    if (m_frame)
+        m_frame->animation()->beginAnimationUpdate();
+    recalcStyle(Force);
+    if (m_frame)
+        m_frame->animation()->endAnimationUpdate();
+
+#ifdef INSTRUMENT_LAYOUT_SCHEDULING
+    if (!ownerElement())
+        printf("Finished update of style selector at time %d\n", elapsedTime());
+#endif
+
+    if (renderer()) {
+        renderer()->setNeedsLayoutAndPrefWidthsRecalc();
+        if (view())
+            view()->scheduleRelayout();
+    }
+
+    if (m_mediaQueryMatcher)
+        m_mediaQueryMatcher->styleSelectorChanged();
+}
+
+void Document::addStyleSheetCandidateNode(Node* node, bool createdByParser)
+{
+    // Until the <body> exists, we have no choice but to compare document positions,
+    // since styles outside of the body and head continue to be shunted into the head
+    // (and thus can shift to end up before dynamically added DOM content that is also
+    // outside the body).
+    if ((createdByParser && body()) || m_styleSheetCandidateNodes.isEmpty()) {
+        m_styleSheetCandidateNodes.add(node);
+        return;
+    }
+
+    // Determine an appropriate insertion point.
+    StyleSheetCandidateListHashSet::iterator begin = m_styleSheetCandidateNodes.begin();
+    StyleSheetCandidateListHashSet::iterator end = m_styleSheetCandidateNodes.end();
+    StyleSheetCandidateListHashSet::iterator it = end;
+    Node* followingNode = 0;
+    do {
+        --it;
+        Node* n = *it;
+        unsigned short position = n->compareDocumentPosition(node);
+        if (position == DOCUMENT_POSITION_FOLLOWING) {
+            m_styleSheetCandidateNodes.insertBefore(followingNode, node);
+            return;
+        }
+        followingNode = n;
+    } while (it != begin);
+    
+    m_styleSheetCandidateNodes.insertBefore(followingNode, node);
+}
+
+void Document::removeStyleSheetCandidateNode(Node* node)
+{
+    m_styleSheetCandidateNodes.remove(node);
+}
+
+void Document::recalcStyleSelector()
+{
+    if (!renderer() || !attached())
+        return;
+
+    StyleSheetVector sheets;
+
+    bool matchAuthorAndUserStyles = true;
+    if (Settings* settings = this->settings())
+        matchAuthorAndUserStyles = settings->authorAndUserStylesEnabled();
+
+    StyleSheetCandidateListHashSet::iterator begin = m_styleSheetCandidateNodes.begin();
+    StyleSheetCandidateListHashSet::iterator end = m_styleSheetCandidateNodes.end();
+    if (!matchAuthorAndUserStyles)
+        end = begin;
+    for (StyleSheetCandidateListHashSet::iterator it = begin; it != end; ++it) {
+        Node* n = *it;
+
+        StyleSheet* sheet = 0;
+
+        if (n->nodeType() == PROCESSING_INSTRUCTION_NODE) {
+            // Processing instruction (XML documents only).
+            // We don't support linking to embedded CSS stylesheets, see <https://bugs.webkit.org/show_bug.cgi?id=49281> for discussion.
+            ProcessingInstruction* pi = static_cast<ProcessingInstruction*>(n);
+            sheet = pi->sheet();
+#if ENABLE(XSLT)
+            // Don't apply XSL transforms to already transformed documents -- <rdar://problem/4132806>
+            if (pi->isXSL() && !transformSourceDocument()) {
+                // Don't apply XSL transforms until loading is finished.
+                if (!parsing())
+                    applyXSLTransform(pi);
+                return;
+            }
+#endif
+        } else if ((n->isHTMLElement() && (n->hasTagName(linkTag) || n->hasTagName(styleTag)))
+#if ENABLE(SVG)
+            ||  (n->isSVGElement() && n->hasTagName(SVGNames::styleTag))
+#endif
+        ) {
+            Element* e = static_cast<Element*>(n);
+            AtomicString title = e->getAttribute(titleAttr);
+            bool enabledViaScript = false;
+            if (e->hasLocalName(linkTag)) {
+                // <LINK> element
+                HTMLLinkElement* linkElement = static_cast<HTMLLinkElement*>(n);
+                if (linkElement->isDisabled())
+                    continue;
+                enabledViaScript = linkElement->isEnabledViaScript();
+                if (linkElement->isLoading()) {
+                    // it is loading but we should still decide which style sheet set to use
+                    if (!enabledViaScript && !title.isEmpty() && m_preferredStylesheetSet.isEmpty()) {
+                        const AtomicString& rel = e->getAttribute(relAttr);
+                        if (!rel.contains("alternate")) {
+                            m_preferredStylesheetSet = title;
+                            m_selectedStylesheetSet = title;
+                        }
+                    }
+                    continue;
+                }
+                if (!linkElement->sheet())
+                    title = nullAtom;
+            }
+
+            // Get the current preferred styleset.  This is the
+            // set of sheets that will be enabled.
+#if ENABLE(SVG)
+            if (n->isSVGElement() && n->hasTagName(SVGNames::styleTag))
+                sheet = static_cast<SVGStyleElement*>(n)->sheet();
+            else
+#endif
+            if (e->hasLocalName(linkTag))
+                sheet = static_cast<HTMLLinkElement*>(n)->sheet();
+            else
+                // <STYLE> element
+                sheet = static_cast<HTMLStyleElement*>(n)->sheet();
+
+            // Check to see if this sheet belongs to a styleset
+            // (thus making it PREFERRED or ALTERNATE rather than
+            // PERSISTENT).
+            if (!enabledViaScript && !title.isEmpty()) {
+                // Yes, we have a title.
+                if (m_preferredStylesheetSet.isEmpty()) {
+                    // No preferred set has been established.  If
+                    // we are NOT an alternate sheet, then establish
+                    // us as the preferred set.  Otherwise, just ignore
+                    // this sheet.
+                    AtomicString rel = e->getAttribute(relAttr);
+                    if (e->hasLocalName(styleTag) || !rel.contains("alternate"))
+                        m_preferredStylesheetSet = m_selectedStylesheetSet = title;
+                }
+
+                if (title != m_preferredStylesheetSet)
+                    sheet = 0;
+            }
+        }
+
+        if (sheet)
+            sheets.append(sheet);
+    }
+
+    m_styleSheets->swap(sheets);
+
+    m_styleSelector.clear();
+    m_didCalculateStyleSelector = true;
+}
+
+void Document::setHoverNode(PassRefPtr<Node> newHoverNode)
+{
+    m_hoverNode = newHoverNode;
+}
+
+void Document::setActiveNode(PassRefPtr<Node> newActiveNode)
+{
+    m_activeNode = newActiveNode;
+}
+
+void Document::focusedNodeRemoved()
+{
+    setFocusedNode(0);
+}
+
+void Document::removeFocusedNodeOfSubtree(Node* node, bool amongChildrenOnly)
+{
+    if (!m_focusedNode || this->inPageCache()) // If the document is in the page cache, then we don't need to clear out the focused node.
+        return;
+        
+    bool nodeInSubtree = false;
+    if (amongChildrenOnly)
+        nodeInSubtree = m_focusedNode->isDescendantOf(node);
+    else
+        nodeInSubtree = (m_focusedNode == node) || m_focusedNode->isDescendantOf(node);
+    
+    if (nodeInSubtree)
+        document()->focusedNodeRemoved();
+}
+
+void Document::hoveredNodeDetached(Node* node)
+{
+    if (!m_hoverNode || (node != m_hoverNode && (!m_hoverNode->isTextNode() || node != m_hoverNode->parentNode())))
+        return;
+
+    m_hoverNode = node->parentNode();
+    while (m_hoverNode && !m_hoverNode->renderer())
+        m_hoverNode = m_hoverNode->parentNode();
+    if (frame())
+        frame()->eventHandler()->scheduleHoverStateUpdate();
+}
+
+void Document::activeChainNodeDetached(Node* node)
+{
+    if (!m_activeNode || (node != m_activeNode && (!m_activeNode->isTextNode() || node != m_activeNode->parentNode())))
+        return;
+
+    m_activeNode = node->parentNode();
+    while (m_activeNode && !m_activeNode->renderer())
+        m_activeNode = m_activeNode->parentNode();
+}
+
+#if ENABLE(DASHBOARD_SUPPORT)
+const Vector<DashboardRegionValue>& Document::dashboardRegions() const
+{
+    return m_dashboardRegions;
+}
+
+void Document::setDashboardRegions(const Vector<DashboardRegionValue>& regions)
+{
+    m_dashboardRegions = regions;
+    setDashboardRegionsDirty(false);
+}
+#endif
+
+bool Document::setFocusedNode(PassRefPtr<Node> newFocusedNode)
+{    
+    // Make sure newFocusedNode is actually in this document
+    if (newFocusedNode && (newFocusedNode->document() != this))
+        return true;
+
+    if (m_focusedNode == newFocusedNode)
+        return true;
+
+    if (m_inPageCache)
+        return false;
+
+    bool focusChangeBlocked = false;
+    RefPtr<Node> oldFocusedNode = m_focusedNode;
+    m_focusedNode = 0;
+
+    // Remove focus from the existing focus node (if any)
+    if (oldFocusedNode && !oldFocusedNode->inDetach()) { 
+        if (oldFocusedNode->active())
+            oldFocusedNode->setActive(false);
+
+        oldFocusedNode->setFocus(false);
+
+        // Dispatch a change event for text fields or textareas that have been edited
+        RenderObject* r = oldFocusedNode->renderer();
+        if (r && r->isTextControl() && toRenderTextControl(r)->wasChangedSinceLastChangeEvent()) {
+            static_cast<Element*>(oldFocusedNode.get())->dispatchFormControlChangeEvent();
+            r = oldFocusedNode->renderer();
+            if (r && r->isTextControl())
+                toRenderTextControl(r)->setChangedSinceLastChangeEvent(false);
+        }
+
+        // Dispatch the blur event and let the node do any other blur related activities (important for text fields)
+        oldFocusedNode->dispatchBlurEvent();
+
+        if (m_focusedNode) {
+            // handler shifted focus
+            focusChangeBlocked = true;
+            newFocusedNode = 0;
+        }
+        
+        oldFocusedNode->dispatchUIEvent(eventNames().focusoutEvent, 0, 0); // DOM level 3 name for the bubbling blur event.
+        // FIXME: We should remove firing DOMFocusOutEvent event when we are sure no content depends
+        // on it, probably when <rdar://problem/8503958> is resolved.
+        oldFocusedNode->dispatchUIEvent(eventNames().DOMFocusOutEvent, 0, 0); // DOM level 2 name for compatibility.
+
+        if (m_focusedNode) {
+            // handler shifted focus
+            focusChangeBlocked = true;
+            newFocusedNode = 0;
+        }
+        if (oldFocusedNode == this && oldFocusedNode->hasOneRef())
+            return true;
+            
+        if (oldFocusedNode == oldFocusedNode->rootEditableElement())
+            frame()->editor()->didEndEditing();
+
+        if (view()) {
+            Widget* oldWidget = widgetForNode(oldFocusedNode.get());
+            if (oldWidget)
+                oldWidget->setFocus(false);
+            else
+                view()->setFocus(false);
+        }
+    }
+
+    if (newFocusedNode) {
+        if (newFocusedNode == newFocusedNode->rootEditableElement() && !acceptsEditingFocus(newFocusedNode.get())) {
+            // delegate blocks focus change
+            focusChangeBlocked = true;
+            goto SetFocusedNodeDone;
+        }
+        // Set focus on the new node
+        m_focusedNode = newFocusedNode.get();
+
+        // Dispatch the focus event and let the node do any other focus related activities (important for text fields)
+        m_focusedNode->dispatchFocusEvent();
+
+        if (m_focusedNode != newFocusedNode) {
+            // handler shifted focus
+            focusChangeBlocked = true;
+            goto SetFocusedNodeDone;
+        }
+
+        m_focusedNode->dispatchUIEvent(eventNames().focusinEvent, 0, 0); // DOM level 3 bubbling focus event.
+        // FIXME: We should remove firing DOMFocusInEvent event when we are sure no content depends
+        // on it, probably when <rdar://problem/8503958> is resolved.
+        m_focusedNode->dispatchUIEvent(eventNames().DOMFocusInEvent, 0, 0); // DOM level 2 for compatibility.
+
+        if (m_focusedNode != newFocusedNode) { 
+            // handler shifted focus
+            focusChangeBlocked = true;
+            goto SetFocusedNodeDone;
+        }
+        m_focusedNode->setFocus(true);
+
+        if (m_focusedNode == m_focusedNode->rootEditableElement())
+            frame()->editor()->didBeginEditing();
+
+        // eww, I suck. set the qt focus correctly
+        // ### find a better place in the code for this
+        if (view()) {
+            Widget* focusWidget = widgetForNode(m_focusedNode.get());
+            if (focusWidget) {
+                // Make sure a widget has the right size before giving it focus.
+                // Otherwise, we are testing edge cases of the Widget code.
+                // Specifically, in WebCore this does not work well for text fields.
+                updateLayout();
+                // Re-get the widget in case updating the layout changed things.
+                focusWidget = widgetForNode(m_focusedNode.get());
+            }
+            if (focusWidget)
+                focusWidget->setFocus(true);
+            else
+                view()->setFocus(true);
+        }
+    }
+
+#if PLATFORM(MAC) || PLATFORM(WIN) || PLATFORM(GTK) || PLATFORM(CHROMIUM)
+    if (!focusChangeBlocked && m_focusedNode && AXObjectCache::accessibilityEnabled()) {
+        RenderObject* oldFocusedRenderer = 0;
+        RenderObject* newFocusedRenderer = 0;
+
+        if (oldFocusedNode)
+            oldFocusedRenderer = oldFocusedNode->renderer();
+        if (newFocusedNode)
+            newFocusedRenderer = newFocusedNode->renderer();
+
+        axObjectCache()->handleFocusedUIElementChanged(oldFocusedRenderer, newFocusedRenderer);
+    }
+#endif
+    if (!focusChangeBlocked)
+        page()->chrome()->focusedNodeChanged(m_focusedNode.get());
+
+SetFocusedNodeDone:
+    updateStyleIfNeeded();
+    return !focusChangeBlocked;
+}
+    
+void Document::getFocusableNodes(Vector<RefPtr<Node> >& nodes)
+{
+    updateLayout();
+
+    for (Node* node = firstChild(); node; node = node->traverseNextNode()) {
+        if (node->isFocusable())
+            nodes.append(node);
+    }
+}
+  
+void Document::setCSSTarget(Element* n)
+{
+    if (m_cssTarget)
+        m_cssTarget->setNeedsStyleRecalc();
+    m_cssTarget = n;
+    if (n)
+        n->setNeedsStyleRecalc();
+}
+
+void Document::attachNodeIterator(NodeIterator* ni)
+{
+    m_nodeIterators.add(ni);
+}
+
+void Document::detachNodeIterator(NodeIterator* ni)
+{
+    // The node iterator can be detached without having been attached if its root node didn't have a document
+    // when the iterator was created, but has it now.
+    m_nodeIterators.remove(ni);
+}
+
+void Document::moveNodeIteratorsToNewDocument(Node* node, Document* newDocument)
+{
+    HashSet<NodeIterator*> nodeIteratorsList = m_nodeIterators;
+    HashSet<NodeIterator*>::const_iterator nodeIteratorsEnd = nodeIteratorsList.end();
+    for (HashSet<NodeIterator*>::const_iterator it = nodeIteratorsList.begin(); it != nodeIteratorsEnd; ++it) {
+        if ((*it)->root() == node) {
+            detachNodeIterator(*it);
+            newDocument->attachNodeIterator(*it);
+        }
+    }
+}
+
+void Document::nodeChildrenChanged(ContainerNode* container)
+{
+    if (!disableRangeMutation(page())) {
+        HashSet<Range*>::const_iterator end = m_ranges.end();
+        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
+            (*it)->nodeChildrenChanged(container);
+    }
+}
+
+void Document::nodeChildrenWillBeRemoved(ContainerNode* container)
+{
+    if (!disableRangeMutation(page())) {
+        HashSet<Range*>::const_iterator end = m_ranges.end();
+        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
+            (*it)->nodeChildrenWillBeRemoved(container);
+    }
+
+    HashSet<NodeIterator*>::const_iterator nodeIteratorsEnd = m_nodeIterators.end();
+    for (HashSet<NodeIterator*>::const_iterator it = m_nodeIterators.begin(); it != nodeIteratorsEnd; ++it) {
+        for (Node* n = container->firstChild(); n; n = n->nextSibling())
+            (*it)->nodeWillBeRemoved(n);
+    }
+
+    if (Frame* frame = this->frame()) {
+        for (Node* n = container->firstChild(); n; n = n->nextSibling()) {
+            frame->selection()->nodeWillBeRemoved(n);
+            frame->page()->dragCaretController()->nodeWillBeRemoved(n);
+        }
+    }
+}
+
+void Document::nodeWillBeRemoved(Node* n)
+{
+    HashSet<NodeIterator*>::const_iterator nodeIteratorsEnd = m_nodeIterators.end();
+    for (HashSet<NodeIterator*>::const_iterator it = m_nodeIterators.begin(); it != nodeIteratorsEnd; ++it)
+        (*it)->nodeWillBeRemoved(n);
+
+    if (!disableRangeMutation(page())) {
+        HashSet<Range*>::const_iterator rangesEnd = m_ranges.end();
+        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != rangesEnd; ++it)
+            (*it)->nodeWillBeRemoved(n);
+    }
+
+    if (Frame* frame = this->frame()) {
+        frame->selection()->nodeWillBeRemoved(n);
+        frame->page()->dragCaretController()->nodeWillBeRemoved(n);
+    }
+    
+#if ENABLE(FULLSCREEN_API)
+    // If the current full screen element or any of its ancestors is removed, set the current
+    // full screen element to the document root, and fire a fullscreenchange event to inform 
+    // clients of the DOM.
+    ASSERT(n);
+    if (n->contains(m_fullScreenElement.get())) {
+        ASSERT(n != documentElement());
+        setFullScreenRenderer(0);
+        m_fullScreenElement = documentElement();
+        m_fullScreenElement->setNeedsStyleRecalc();
+        m_fullScreenElement->detach();
+        updateStyleIfNeeded();
+        m_fullScreenChangeDelayTimer.startOneShot(0);
+    }
+#endif
+}
+
+void Document::textInserted(Node* text, unsigned offset, unsigned length)
+{
+    if (!disableRangeMutation(page())) {
+        HashSet<Range*>::const_iterator end = m_ranges.end();
+        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
+            (*it)->textInserted(text, offset, length);
+    }
+
+    // Update the markers for spelling and grammar checking.
+    m_markers->shiftMarkers(text, offset, length);
+}
+
+void Document::textRemoved(Node* text, unsigned offset, unsigned length)
+{
+    if (!disableRangeMutation(page())) {
+        HashSet<Range*>::const_iterator end = m_ranges.end();
+        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
+            (*it)->textRemoved(text, offset, length);
+    }
+
+    // Update the markers for spelling and grammar checking.
+    m_markers->removeMarkers(text, offset, length);
+    m_markers->shiftMarkers(text, offset + length, 0 - length);
+}
+
+void Document::textNodesMerged(Text* oldNode, unsigned offset)
+{
+    if (!disableRangeMutation(page())) {
+        NodeWithIndex oldNodeWithIndex(oldNode);
+        HashSet<Range*>::const_iterator end = m_ranges.end();
+        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
+            (*it)->textNodesMerged(oldNodeWithIndex, offset);
+    }
+
+    // FIXME: This should update markers for spelling and grammar checking.
+}
+
+void Document::textNodeSplit(Text* oldNode)
+{
+    if (!disableRangeMutation(page())) {
+        HashSet<Range*>::const_iterator end = m_ranges.end();
+        for (HashSet<Range*>::const_iterator it = m_ranges.begin(); it != end; ++it)
+            (*it)->textNodeSplit(oldNode);
+    }
+
+    // FIXME: This should update markers for spelling and grammar checking.
+}
+
+// FIXME: eventually, this should return a DOMWindow stored in the document.
+DOMWindow* Document::domWindow() const
+{
+    if (!frame())
+        return 0;
+
+    // The m_frame pointer is not (not always?) zeroed out when the document is put into b/f cache, so the frame can hold an unrelated document/window pair.
+    // FIXME: We should always zero out the frame pointer on navigation to avoid accidentally accessing the new frame content.
+    if (m_frame->document() != this)
+        return 0;
+
+    return frame()->domWindow();
+}
+
+void Document::setWindowAttributeEventListener(const AtomicString& eventType, PassRefPtr<EventListener> listener)
+{
+    DOMWindow* domWindow = this->domWindow();
+    if (!domWindow)
+        return;
+    domWindow->setAttributeEventListener(eventType, listener);
+}
+
+EventListener* Document::getWindowAttributeEventListener(const AtomicString& eventType)
+{
+    DOMWindow* domWindow = this->domWindow();
+    if (!domWindow)
+        return 0;
+    return domWindow->getAttributeEventListener(eventType);
+}
+
+void Document::dispatchWindowEvent(PassRefPtr<Event> event,  PassRefPtr<EventTarget> target)
+{
+    ASSERT(!eventDispatchForbidden());
+    DOMWindow* domWindow = this->domWindow();
+    if (!domWindow)
+        return;
+    domWindow->dispatchEvent(event, target);
+}
+
+void Document::dispatchWindowLoadEvent()
+{
+    ASSERT(!eventDispatchForbidden());
+    DOMWindow* domWindow = this->domWindow();
+    if (!domWindow)
+        return;
+    domWindow->dispatchLoadEvent();
+}
+
+void Document::enqueueWindowEvent(PassRefPtr<Event> event)
+{
+    event->setTarget(domWindow());
+    m_eventQueue->enqueueEvent(event);
+}
+
+PassRefPtr<Event> Document::createEvent(const String& eventType, ExceptionCode& ec)
+{
+    RefPtr<Event> event;
+    if (eventType == "Event" || eventType == "Events" || eventType == "HTMLEvents")
+        event = Event::create();
+    else if (eventType == "CustomEvent")
+        event = CustomEvent::create();
+    else if (eventType == "KeyboardEvent" || eventType == "KeyboardEvents")
+        event = KeyboardEvent::create();
+    else if (eventType == "MessageEvent")
+        event = MessageEvent::create();
+    else if (eventType == "MouseEvent" || eventType == "MouseEvents")
+        event = MouseEvent::create();
+    else if (eventType == "MutationEvent" || eventType == "MutationEvents")
+        event = MutationEvent::create();
+    else if (eventType == "OverflowEvent")
+        event = OverflowEvent::create();
+    else if (eventType == "PageTransitionEvent")
+        event = PageTransitionEvent::create();
+    else if (eventType == "ProgressEvent")
+        event = ProgressEvent::create();
+#if ENABLE(DOM_STORAGE)
+    else if (eventType == "StorageEvent")
+        event = StorageEvent::create();
+#endif
+    else if (eventType == "TextEvent")
+        event = TextEvent::create();
+    else if (eventType == "UIEvent" || eventType == "UIEvents")
+        event = UIEvent::create();
+    else if (eventType == "WebKitAnimationEvent")
+        event = WebKitAnimationEvent::create();
+    else if (eventType == "WebKitTransitionEvent")
+        event = WebKitTransitionEvent::create();
+    else if (eventType == "WheelEvent")
+        event = WheelEvent::create();
+#if ENABLE(SVG)
+    else if (eventType == "SVGEvents")
+        event = Event::create();
+    else if (eventType == "SVGZoomEvents")
+        event = SVGZoomEvent::create();
+#endif
+#if ENABLE(TOUCH_EVENTS)
+#if USE(V8)
+    else if (eventType == "TouchEvent" && RuntimeEnabledFeatures::touchEnabled())
+#else
+    else if (eventType == "TouchEvent")
+#endif
+        event = TouchEvent::create();
+#endif
+#if ENABLE(DEVICE_ORIENTATION)
+    else if (eventType == "DeviceMotionEvent")
+        event = DeviceMotionEvent::create();
+    else if (eventType == "DeviceOrientationEvent")
+        event = DeviceOrientationEvent::create();
+#endif
+#if ENABLE(ORIENTATION_EVENTS)
+    else if (eventType == "OrientationEvent")
+        event = Event::create();
+#endif
+    if (event)
+        return event.release();
+
+    ec = NOT_SUPPORTED_ERR;
+    return 0;
+}
+
+void Document::addListenerTypeIfNeeded(const AtomicString& eventType)
+{
+    if (eventType == eventNames().DOMSubtreeModifiedEvent)
+        addListenerType(DOMSUBTREEMODIFIED_LISTENER);
+    else if (eventType == eventNames().DOMNodeInsertedEvent)
+        addListenerType(DOMNODEINSERTED_LISTENER);
+    else if (eventType == eventNames().DOMNodeRemovedEvent)
+        addListenerType(DOMNODEREMOVED_LISTENER);
+    else if (eventType == eventNames().DOMNodeRemovedFromDocumentEvent)
+        addListenerType(DOMNODEREMOVEDFROMDOCUMENT_LISTENER);
+    else if (eventType == eventNames().DOMNodeInsertedIntoDocumentEvent)
+        addListenerType(DOMNODEINSERTEDINTODOCUMENT_LISTENER);
+    else if (eventType == eventNames().DOMAttrModifiedEvent)
+        addListenerType(DOMATTRMODIFIED_LISTENER);
+    else if (eventType == eventNames().DOMCharacterDataModifiedEvent)
+        addListenerType(DOMCHARACTERDATAMODIFIED_LISTENER);
+    else if (eventType == eventNames().overflowchangedEvent)
+        addListenerType(OVERFLOWCHANGED_LISTENER);
+    else if (eventType == eventNames().webkitAnimationStartEvent)
+        addListenerType(ANIMATIONSTART_LISTENER);
+    else if (eventType == eventNames().webkitAnimationEndEvent)
+        addListenerType(ANIMATIONEND_LISTENER);
+    else if (eventType == eventNames().webkitAnimationIterationEvent)
+        addListenerType(ANIMATIONITERATION_LISTENER);
+    else if (eventType == eventNames().webkitTransitionEndEvent)
+        addListenerType(TRANSITIONEND_LISTENER);
+    else if (eventType == eventNames().beforeloadEvent)
+        addListenerType(BEFORELOAD_LISTENER);
+    else if (eventType == eventNames().beforeprocessEvent)
+        addListenerType(BEFOREPROCESS_LISTENER);
+#if ENABLE(TOUCH_EVENTS)
+    else if (eventType == eventNames().touchstartEvent
+             || eventType == eventNames().touchmoveEvent
+             || eventType == eventNames().touchendEvent
+             || eventType == eventNames().touchcancelEvent) {
+        addListenerType(TOUCH_LISTENER);
+        if (Page* page = this->page())
+            page->chrome()->client()->needTouchEvents(true);
+    }
+#endif
+}
+
+CSSStyleDeclaration* Document::getOverrideStyle(Element*, const String&)
+{
+    return 0;
+}
+
+HTMLFrameOwnerElement* Document::ownerElement() const
+{
+    if (!frame())
+        return 0;
+    return frame()->ownerElement();
+}
+
+String Document::cookie(ExceptionCode& ec) const
+{
+    if (page() && !page()->cookieEnabled())
+        return String();
+
+    // FIXME: The HTML5 DOM spec states that this attribute can raise an
+    // INVALID_STATE_ERR exception on getting if the Document has no
+    // browsing context.
+
+    if (!securityOrigin()->canAccessCookies()) {
+        ec = SECURITY_ERR;
+        return String();
+    }
+
+    KURL cookieURL = this->cookieURL();
+    if (cookieURL.isEmpty())
+        return String();
+
+    return cookies(this, cookieURL);
+}
+
+void Document::setCookie(const String& value, ExceptionCode& ec)
+{
+    if (page() && !page()->cookieEnabled())
+        return;
+
+    // FIXME: The HTML5 DOM spec states that this attribute can raise an
+    // INVALID_STATE_ERR exception on setting if the Document has no
+    // browsing context.
+
+    if (!securityOrigin()->canAccessCookies()) {
+        ec = SECURITY_ERR;
+        return;
+    }
+
+    KURL cookieURL = this->cookieURL();
+    if (cookieURL.isEmpty())
+        return;
+
+    setCookies(this, cookieURL, value);
+}
+
+String Document::referrer() const
+{
+    if (frame())
+        return frame()->loader()->referrer();
+    return String();
+}
+
+String Document::domain() const
+{
+    return securityOrigin()->domain();
+}
+
+void Document::setDomain(const String& newDomain, ExceptionCode& ec)
+{
+    if (SecurityOrigin::isDomainRelaxationForbiddenForURLScheme(securityOrigin()->protocol())) {
+        ec = SECURITY_ERR;
+        return;
+    }
+
+    // Both NS and IE specify that changing the domain is only allowed when
+    // the new domain is a suffix of the old domain.
+
+    // FIXME: We should add logging indicating why a domain was not allowed.
+
+    // If the new domain is the same as the old domain, still call
+    // securityOrigin()->setDomainForDOM. This will change the
+    // security check behavior. For example, if a page loaded on port 8000
+    // assigns its current domain using document.domain, the page will
+    // allow other pages loaded on different ports in the same domain that
+    // have also assigned to access this page.
+    if (equalIgnoringCase(domain(), newDomain)) {
+        securityOrigin()->setDomainFromDOM(newDomain);
+        if (m_frame)
+            m_frame->script()->updateSecurityOrigin();
+        return;
+    }
+
+    int oldLength = domain().length();
+    int newLength = newDomain.length();
+    // e.g. newDomain = webkit.org (10) and domain() = www.webkit.org (14)
+    if (newLength >= oldLength) {
+        ec = SECURITY_ERR;
+        return;
+    }
+
+    String test = domain();
+    // Check that it's a subdomain, not e.g. "ebkit.org"
+    if (test[oldLength - newLength - 1] != '.') {
+        ec = SECURITY_ERR;
+        return;
+    }
+
+    // Now test is "webkit.org" from domain()
+    // and we check that it's the same thing as newDomain
+    test.remove(0, oldLength - newLength);
+    if (test != newDomain) {
+        ec = SECURITY_ERR;
+        return;
+    }
+
+    securityOrigin()->setDomainFromDOM(newDomain);
+    if (m_frame)
+        m_frame->script()->updateSecurityOrigin();
+}
+
+// http://www.whatwg.org/specs/web-apps/current-work/#dom-document-lastmodified
+String Document::lastModified() const
+{
+    DateComponents date;
+    bool foundDate = false;
+    if (m_frame) {
+        String httpLastModified = m_frame->loader()->documentLoader()->response().httpHeaderField("Last-Modified");
+        if (!httpLastModified.isEmpty()) {
+            date.setMillisecondsSinceEpochForDateTime(parseDate(httpLastModified));
+            foundDate = true;
+        }
+    }
+    // FIXME: If this document came from the file system, the HTML5
+    // specificiation tells us to read the last modification date from the file
+    // system.
+    if (!foundDate)
+        date.setMillisecondsSinceEpochForDateTime(currentTimeMS());
+    return String::format("%02d/%02d/%04d %02d:%02d:%02d", date.month() + 1, date.monthDay(), date.fullYear(), date.hour(), date.minute(), date.second());
+}
+
+static bool isValidNameNonASCII(const UChar* characters, unsigned length)
+{
+    unsigned i = 0;
+
+    UChar32 c;
+    U16_NEXT(characters, i, length, c)
+    if (!isValidNameStart(c))
+        return false;
+
+    while (i < length) {
+        U16_NEXT(characters, i, length, c)
+        if (!isValidNamePart(c))
+            return false;
+    }
+
+    return true;
+}
+
+static inline bool isValidNameASCII(const UChar* characters, unsigned length)
+{
+    UChar c = characters[0];
+    if (!(isASCIIAlpha(c) || c == ':' || c == '_'))
+        return false;
+
+    for (unsigned i = 1; i < length; ++i) {
+        c = characters[i];
+        if (!(isASCIIAlphanumeric(c) || c == ':' || c == '_' || c == '-' || c == '.'))
+            return false;
+    }
+
+    return true;
+}
+
+bool Document::isValidName(const String& name)
+{
+    unsigned length = name.length();
+    if (!length)
+        return false;
+
+    const UChar* characters = name.characters();
+    return isValidNameASCII(characters, length) || isValidNameNonASCII(characters, length);
+}
+
+bool Document::parseQualifiedName(const String& qualifiedName, String& prefix, String& localName, ExceptionCode& ec)
+{
+    unsigned length = qualifiedName.length();
+
+    if (!length) {
+        ec = INVALID_CHARACTER_ERR;
+        return false;
+    }
+
+    bool nameStart = true;
+    bool sawColon = false;
+    int colonPos = 0;
+
+    const UChar* s = qualifiedName.characters();
+    for (unsigned i = 0; i < length;) {
+        UChar32 c;
+        U16_NEXT(s, i, length, c)
+        if (c == ':') {
+            if (sawColon) {
+                ec = NAMESPACE_ERR;
+                return false; // multiple colons: not allowed
+            }
+            nameStart = true;
+            sawColon = true;
+            colonPos = i - 1;
+        } else if (nameStart) {
+            if (!isValidNameStart(c)) {
+                ec = INVALID_CHARACTER_ERR;
+                return false;
+            }
+            nameStart = false;
+        } else {
+            if (!isValidNamePart(c)) {
+                ec = INVALID_CHARACTER_ERR;
+                return false;
+            }
+        }
+    }
+
+    if (!sawColon) {
+        prefix = String();
+        localName = qualifiedName;
+    } else {
+        prefix = qualifiedName.substring(0, colonPos);
+        if (prefix.isEmpty()) {
+            ec = NAMESPACE_ERR;
+            return false;
+        }
+        localName = qualifiedName.substring(colonPos + 1);
+    }
+
+    if (localName.isEmpty()) {
+        ec = NAMESPACE_ERR;
+        return false;
+    }
+
+    return true;
+}
+
+void Document::addImageMap(HTMLMapElement* imageMap)
+{
+    AtomicStringImpl* name = imageMap->getName().impl();
+    if (!name)
+        return;
+    m_imageMapsByName.add(name, imageMap);
+}
+
+void Document::removeImageMap(HTMLMapElement* imageMap)
+{
+    AtomicStringImpl* name = imageMap->getName().impl();
+    if (!name)
+        return;
+    m_imageMapsByName.remove(name, imageMap);
+}
+
+inline bool keyMatchesMapName(AtomicStringImpl* key, Element* element)
+{
+    return element->hasTagName(mapTag) && static_cast<HTMLMapElement*>(element)->getName().impl() == key;
+}
+
+inline bool keyMatchesLowercasedMapName(AtomicStringImpl* key, Element* element)
+{
+    return element->hasTagName(mapTag) && static_cast<HTMLMapElement*>(element)->getName().lower().impl() == key;
+}
+
+HTMLMapElement* Document::getImageMap(const String& url) const
+{
+    if (url.isNull())
+        return 0;
+    size_t hashPos = url.find('#');
+    String name = (hashPos == notFound ? url : url.substring(hashPos + 1)).impl();
+    if (isHTMLDocument())
+        return static_cast<HTMLMapElement*>(m_imageMapsByName.get<keyMatchesLowercasedMapName>(AtomicString(name.lower()).impl(), this));
+    return static_cast<HTMLMapElement*>(m_imageMapsByName.get<keyMatchesMapName>(AtomicString(name).impl(), this));
+}
+
+void Document::setDecoder(PassRefPtr<TextResourceDecoder> decoder)
+{
+    m_decoder = decoder;
+}
+
+KURL Document::completeURL(const String& url) const
+{
+    // Always return a null URL when passed a null string.
+    // FIXME: Should we change the KURL constructor to have this behavior?
+    // See also [CSS]StyleSheet::completeURL(const String&)
+    if (url.isNull())
+        return KURL();
+    const KURL& baseURL = ((m_baseURL.isEmpty() || m_baseURL == blankURL()) && parentDocument()) ? parentDocument()->baseURL() : m_baseURL;
+    if (!m_decoder)
+        return KURL(baseURL, url);
+    return KURL(baseURL, url, m_decoder->encoding());
+}
+
+void Document::setInPageCache(bool flag)
+{
+    if (m_inPageCache == flag)
+        return;
+
+    m_inPageCache = flag;
+    if (flag) {
+        ASSERT(!m_savedRenderer);
+        m_savedRenderer = renderer();
+        if (FrameView* v = view())
+            v->resetScrollbars();
+        m_styleRecalcTimer.stop();
+    } else {
+        ASSERT(!renderer() || renderer() == m_savedRenderer);
+        ASSERT(m_renderArena);
+        setRenderer(m_savedRenderer);
+        m_savedRenderer = 0;
+
+        if (frame() && frame()->page())
+            frame()->page()->updateViewportArguments();
+
+        if (childNeedsStyleRecalc())
+            scheduleStyleRecalc();
+    }
+}
+
+void Document::documentWillBecomeInactive() 
+{
+#if USE(ACCELERATED_COMPOSITING)
+    if (renderer())
+        renderView()->willMoveOffscreen();
+#endif
+
+    HashSet<Element*>::iterator end = m_documentActivationCallbackElements.end();
+    for (HashSet<Element*>::iterator i = m_documentActivationCallbackElements.begin(); i != end; ++i)
+        (*i)->documentWillBecomeInactive();
+}
+
+void Document::documentDidBecomeActive() 
+{
+    HashSet<Element*>::iterator end = m_documentActivationCallbackElements.end();
+    for (HashSet<Element*>::iterator i = m_documentActivationCallbackElements.begin(); i != end; ++i)
+        (*i)->documentDidBecomeActive();
+
+#if USE(ACCELERATED_COMPOSITING)
+    if (renderer())
+        renderView()->didMoveOnscreen();
+#endif
+
+    ASSERT(m_frame);
+    m_frame->loader()->client()->dispatchDidBecomeFrameset(isFrameSet());
+}
+
+void Document::registerForDocumentActivationCallbacks(Element* e)
+{
+    m_documentActivationCallbackElements.add(e);
+}
+
+void Document::unregisterForDocumentActivationCallbacks(Element* e)
+{
+    m_documentActivationCallbackElements.remove(e);
+}
+
+void Document::mediaVolumeDidChange() 
+{
+    HashSet<Element*>::iterator end = m_mediaVolumeCallbackElements.end();
+    for (HashSet<Element*>::iterator i = m_mediaVolumeCallbackElements.begin(); i != end; ++i)
+        (*i)->mediaVolumeDidChange();
+}
+
+void Document::registerForMediaVolumeCallbacks(Element* e)
+{
+    m_mediaVolumeCallbackElements.add(e);
+}
+
+void Document::unregisterForMediaVolumeCallbacks(Element* e)
+{
+    m_mediaVolumeCallbackElements.remove(e);
+}
+
+void Document::setShouldCreateRenderers(bool f)
+{
+    m_createRenderers = f;
+}
+
+bool Document::shouldCreateRenderers()
+{
+    return m_createRenderers;
+}
+
+// Support for Javascript execCommand, and related methods
+
+static Editor::Command command(Document* document, const String& commandName, bool userInterface = false)
+{
+    Frame* frame = document->frame();
+    if (!frame || frame->document() != document)
+        return Editor::Command();
+
+    document->updateStyleIfNeeded();
+
+    return frame->editor()->command(commandName,
+        userInterface ? CommandFromDOMWithUserInterface : CommandFromDOM);
+}
+
+bool Document::execCommand(const String& commandName, bool userInterface, const String& value)
+{
+    return command(this, commandName, userInterface).execute(value);
+}
+
+bool Document::queryCommandEnabled(const String& commandName)
+{
+    return command(this, commandName).isEnabled();
+}
+
+bool Document::queryCommandIndeterm(const String& commandName)
+{
+    return command(this, commandName).state() == MixedTriState;
+}
+
+bool Document::queryCommandState(const String& commandName)
+{
+    return command(this, commandName).state() == TrueTriState;
+}
+
+bool Document::queryCommandSupported(const String& commandName)
+{
+    return command(this, commandName).isSupported();
+}
+
+String Document::queryCommandValue(const String& commandName)
+{
+    return command(this, commandName).value();
+}
+
+#if ENABLE(XSLT)
+
+void Document::applyXSLTransform(ProcessingInstruction* pi)
+{
+    RefPtr<XSLTProcessor> processor = XSLTProcessor::create();
+    processor->setXSLStyleSheet(static_cast<XSLStyleSheet*>(pi->sheet()));
+    String resultMIMEType;
+    String newSource;
+    String resultEncoding;
+    if (!processor->transformToString(this, resultMIMEType, newSource, resultEncoding))
+        return;
+    // FIXME: If the transform failed we should probably report an error (like Mozilla does).
+    processor->createDocumentFromSource(newSource, resultEncoding, resultMIMEType, this, frame());
+}
+
+void Document::setTransformSource(PassOwnPtr<TransformSource> source)
+{
+    if (m_transformSource == source)
+        return;
+    m_transformSource = source;
+}
+
+#endif
+
+void Document::setDesignMode(InheritedBool value)
+{
+    m_designMode = value;
+}
+
+Document::InheritedBool Document::getDesignMode() const
+{
+    return m_designMode;
+}
+
+bool Document::inDesignMode() const
+{
+    for (const Document* d = this; d; d = d->parentDocument()) {
+        if (d->m_designMode != inherit)
+            return d->m_designMode;
+    }
+    return false;
+}
+
+Document* Document::parentDocument() const
+{
+    if (!m_frame)
+        return 0;
+    Frame* parent = m_frame->tree()->parent();
+    if (!parent)
+        return 0;
+    return parent->document();
+}
+
+Document* Document::topDocument() const
+{
+    Document* doc = const_cast<Document *>(this);
+    Element* element;
+    while ((element = doc->ownerElement()))
+        doc = element->document();
+    
+    return doc;
+}
+
+PassRefPtr<Attr> Document::createAttribute(const String& name, ExceptionCode& ec)
+{
+    return createAttributeNS(String(), name, ec, true);
+}
+
+PassRefPtr<Attr> Document::createAttributeNS(const String& namespaceURI, const String& qualifiedName, ExceptionCode& ec, bool shouldIgnoreNamespaceChecks)
+{
+    String prefix, localName;
+    if (!parseQualifiedName(qualifiedName, prefix, localName, ec))
+        return 0;
+
+    QualifiedName qName(prefix, localName, namespaceURI);
+    if (!shouldIgnoreNamespaceChecks && hasPrefixNamespaceMismatch(qName)) {
+        ec = NAMESPACE_ERR;
+        return 0;
+    }
+
+    // Spec: DOM Level 2 Core: http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-DocCrAttrNS
+    if (!shouldIgnoreNamespaceChecks && qName.localName() == xmlnsAtom && qName.namespaceURI() != XMLNSNames::xmlnsNamespaceURI) {
+        ec = NAMESPACE_ERR;
+        return 0;
+    }
+
+    // FIXME: Assume this is a mapped attribute, since createAttribute isn't namespace-aware.  There's no harm to XML
+    // documents if we're wrong.
+    return Attr::create(0, this, Attribute::createMapped(qName, StringImpl::empty()));
+}
+
+#if ENABLE(SVG)
+const SVGDocumentExtensions* Document::svgExtensions()
+{
+    return m_svgExtensions.get();
+}
+
+SVGDocumentExtensions* Document::accessSVGExtensions()
+{
+    if (!m_svgExtensions)
+        m_svgExtensions = adoptPtr(new SVGDocumentExtensions(this));
+    return m_svgExtensions.get();
+}
+
+bool Document::hasSVGRootNode() const
+{
+    return documentElement() && documentElement()->hasTagName(SVGNames::svgTag);
+}
+#endif
+
+PassRefPtr<HTMLCollection> Document::images()
+{
+    return HTMLCollection::create(this, DocImages);
+}
+
+PassRefPtr<HTMLCollection> Document::applets()
+{
+    return HTMLCollection::create(this, DocApplets);
+}
+
+PassRefPtr<HTMLCollection> Document::embeds()
+{
+    return HTMLCollection::create(this, DocEmbeds);
+}
+
+PassRefPtr<HTMLCollection> Document::plugins()
+{
+    // This is an alias for embeds() required for the JS DOM bindings.
+    return HTMLCollection::create(this, DocEmbeds);
+}
+
+PassRefPtr<HTMLCollection> Document::objects()
+{
+    return HTMLCollection::create(this, DocObjects);
+}
+
+PassRefPtr<HTMLCollection> Document::scripts()
+{
+    return HTMLCollection::create(this, DocScripts);
+}
+
+PassRefPtr<HTMLCollection> Document::links()
+{
+    return HTMLCollection::create(this, DocLinks);
+}
+
+PassRefPtr<HTMLCollection> Document::forms()
+{
+    return HTMLCollection::create(this, DocForms);
+}
+
+PassRefPtr<HTMLCollection> Document::anchors()
+{
+    return HTMLCollection::create(this, DocAnchors);
+}
+
+PassRefPtr<HTMLAllCollection> Document::all()
+{
+    return HTMLAllCollection::create(this);
+}
+
+PassRefPtr<HTMLCollection> Document::windowNamedItems(const String &name)
+{
+    return HTMLNameCollection::create(this, WindowNamedItems, name);
+}
+
+PassRefPtr<HTMLCollection> Document::documentNamedItems(const String &name)
+{
+    return HTMLNameCollection::create(this, DocumentNamedItems, name);
+}
+
+CollectionCache* Document::nameCollectionInfo(CollectionType type, const AtomicString& name)
+{
+    ASSERT(type >= FirstNamedDocumentCachedType);
+    unsigned index = type - FirstNamedDocumentCachedType;
+    ASSERT(index < NumNamedDocumentCachedTypes);
+
+    NamedCollectionMap& map = m_nameCollectionInfo[index];
+    NamedCollectionMap::iterator iter = map.find(name.impl());
+    if (iter == map.end())
+        iter = map.add(name.impl(), new CollectionCache).first;
+    iter->second->checkConsistency();
+    return iter->second;
+}
+
+void Document::finishedParsing()
+{
+    ASSERT(!scriptableDocumentParser() || !m_parser->isParsing());
+    ASSERT(!scriptableDocumentParser() || m_readyState != Loading);
+    setParsing(false);
+    if (!m_documentTiming.domContentLoadedEventStart)
+        m_documentTiming.domContentLoadedEventStart = currentTime();
+    dispatchEvent(Event::create(eventNames().DOMContentLoadedEvent, true, false));
+    if (!m_documentTiming.domContentLoadedEventEnd)
+        m_documentTiming.domContentLoadedEventEnd = currentTime();
+
+    if (Frame* f = frame()) {
+        // FrameLoader::finishedParsing() might end up calling Document::implicitClose() if all
+        // resource loads are complete. HTMLObjectElements can start loading their resources from
+        // post attach callbacks triggered by recalcStyle().  This means if we parse out an <object>
+        // tag and then reach the end of the document without updating styles, we might not have yet
+        // started the resource load and might fire the window load event too early.  To avoid this
+        // we force the styles to be up to date before calling FrameLoader::finishedParsing().
+        // See https://bugs.webkit.org/show_bug.cgi?id=36864 starting around comment 35.
+        updateStyleIfNeeded();
+
+        f->loader()->finishedParsing();
+
+#if ENABLE(INSPECTOR)
+        if (!page())
+            return;
+
+        if (InspectorController* controller = page()->inspectorController())
+            controller->mainResourceFiredDOMContentEvent(f->loader()->documentLoader(), url());
+#endif
+    }
+}
+
+Vector<String> Document::formElementsState() const
+{
+    Vector<String> stateVector;
+    stateVector.reserveInitialCapacity(m_formElementsWithState.size() * 3);
+    typedef FormElementListHashSet::const_iterator Iterator;
+    Iterator end = m_formElementsWithState.end();
+    for (Iterator it = m_formElementsWithState.begin(); it != end; ++it) {
+        Element* elementWithState = *it;
+        String value;
+        if (!elementWithState->shouldSaveAndRestoreFormControlState())
+            continue;
+        if (!elementWithState->saveFormControlState(value))
+            continue;
+        stateVector.append(elementWithState->formControlName().string());
+        stateVector.append(elementWithState->formControlType().string());
+        stateVector.append(value);
+    }
+    return stateVector;
+}
+
+#if ENABLE(XPATH)
+
+PassRefPtr<XPathExpression> Document::createExpression(const String& expression,
+                                                       XPathNSResolver* resolver,
+                                                       ExceptionCode& ec)
+{
+    if (!m_xpathEvaluator)
+        m_xpathEvaluator = XPathEvaluator::create();
+    return m_xpathEvaluator->createExpression(expression, resolver, ec);
+}
+
+PassRefPtr<XPathNSResolver> Document::createNSResolver(Node* nodeResolver)
+{
+    if (!m_xpathEvaluator)
+        m_xpathEvaluator = XPathEvaluator::create();
+    return m_xpathEvaluator->createNSResolver(nodeResolver);
+}
+
+PassRefPtr<XPathResult> Document::evaluate(const String& expression,
+                                           Node* contextNode,
+                                           XPathNSResolver* resolver,
+                                           unsigned short type,
+                                           XPathResult* result,
+                                           ExceptionCode& ec)
+{
+    if (!m_xpathEvaluator)
+        m_xpathEvaluator = XPathEvaluator::create();
+    return m_xpathEvaluator->evaluate(expression, contextNode, resolver, type, result, ec);
+}
+
+#endif // ENABLE(XPATH)
+
+void Document::setStateForNewFormElements(const Vector<String>& stateVector)
+{
+    // Walk the state vector backwards so that the value to use for each
+    // name/type pair first is the one at the end of each individual vector
+    // in the FormElementStateMap. We're using them like stacks.
+    typedef FormElementStateMap::iterator Iterator;
+    m_formElementsWithState.clear();
+    for (size_t i = stateVector.size() / 3 * 3; i; i -= 3) {
+        AtomicString a = stateVector[i - 3];
+        AtomicString b = stateVector[i - 2];
+        const String& c = stateVector[i - 1];
+        FormElementKey key(a.impl(), b.impl());
+        Iterator it = m_stateForNewFormElements.find(key);
+        if (it != m_stateForNewFormElements.end())
+            it->second.append(c);
+        else {
+            Vector<String> v(1);
+            v[0] = c;
+            m_stateForNewFormElements.set(key, v);
+        }
+    }
+}
+
+bool Document::hasStateForNewFormElements() const
+{
+    return !m_stateForNewFormElements.isEmpty();
+}
+
+bool Document::takeStateForFormElement(AtomicStringImpl* name, AtomicStringImpl* type, String& state)
+{
+    typedef FormElementStateMap::iterator Iterator;
+    Iterator it = m_stateForNewFormElements.find(FormElementKey(name, type));
+    if (it == m_stateForNewFormElements.end())
+        return false;
+    ASSERT(it->second.size());
+    state = it->second.last();
+    if (it->second.size() > 1)
+        it->second.removeLast();
+    else
+        m_stateForNewFormElements.remove(it);
+    return true;
+}
+
+FormElementKey::FormElementKey(AtomicStringImpl* name, AtomicStringImpl* type)
+    : m_name(name), m_type(type)
+{
+    ref();
+}
+
+FormElementKey::~FormElementKey()
+{
+    deref();
+}
+
+FormElementKey::FormElementKey(const FormElementKey& other)
+    : m_name(other.name()), m_type(other.type())
+{
+    ref();
+}
+
+FormElementKey& FormElementKey::operator=(const FormElementKey& other)
+{
+    other.ref();
+    deref();
+    m_name = other.name();
+    m_type = other.type();
+    return *this;
+}
+
+void FormElementKey::ref() const
+{
+    if (name())
+        name()->ref();
+    if (type())
+        type()->ref();
+}
+
+void FormElementKey::deref() const
+{
+    if (name())
+        name()->deref();
+    if (type())
+        type()->deref();
+}
+
+unsigned FormElementKeyHash::hash(const FormElementKey& key)
+{
+    return WTF::StringHasher::createBlobHash<sizeof(FormElementKey)>(&key);
+}
+
+void Document::setIconURL(const String& iconURL, const String& type)
+{
+    // FIXME - <rdar://problem/4727645> - At some point in the future, we might actually honor the "type" 
+    if (m_iconURL.isEmpty())
+        m_iconURL = iconURL;
+    else if (!type.isEmpty())
+        m_iconURL = iconURL;
+    if (Frame* f = frame())
+        f->loader()->setIconURL(m_iconURL);
+}
+
+void Document::registerFormElementWithFormAttribute(FormAssociatedElement* element)
+{
+    ASSERT(toHTMLElement(element)->fastHasAttribute(formAttr));
+    m_formElementsWithFormAttribute.add(element);
+}
+
+void Document::unregisterFormElementWithFormAttribute(FormAssociatedElement* element)
+{
+    m_formElementsWithFormAttribute.remove(element);
+}
+
+void Document::resetFormElementsOwner(HTMLFormElement* form)
+{
+    typedef FormAssociatedElementListHashSet::iterator Iterator;
+    Iterator end = m_formElementsWithFormAttribute.end();
+    for (Iterator it = m_formElementsWithFormAttribute.begin(); it != end; ++it)
+        (*it)->resetFormOwner(form);
+}
+
+void Document::setUseSecureKeyboardEntryWhenActive(bool usesSecureKeyboard)
+{
+    if (m_useSecureKeyboardEntryWhenActive == usesSecureKeyboard)
+        return;
+        
+    m_useSecureKeyboardEntryWhenActive = usesSecureKeyboard;
+    m_frame->selection()->updateSecureKeyboardEntryIfActive();
+}
+
+bool Document::useSecureKeyboardEntryWhenActive() const
+{
+    return m_useSecureKeyboardEntryWhenActive;
+}
+
+void Document::initSecurityContext()
+{
+    if (securityOrigin() && !securityOrigin()->isEmpty())
+        return; // m_securityOrigin has already been initialized.
+
+    if (!m_frame) {
+        // No source for a security context.
+        // This can occur via document.implementation.createDocument().
+        m_cookieURL = KURL(ParsedURLString, "");
+        ScriptExecutionContext::setSecurityOrigin(SecurityOrigin::createEmpty());
+        return;
+    }
+
+    // In the common case, create the security context from the currently
+    // loading URL.
+    m_cookieURL = m_url;
+    ScriptExecutionContext::setSecurityOrigin(SecurityOrigin::create(m_url, m_frame->loader()->sandboxFlags()));
+
+    if (SecurityOrigin::allowSubstituteDataAccessToLocal()) {
+        // If this document was loaded with substituteData, then the document can
+        // load local resources.  See https://bugs.webkit.org/show_bug.cgi?id=16756
+        // and https://bugs.webkit.org/show_bug.cgi?id=19760 for further
+        // discussion.
+        DocumentLoader* documentLoader = m_frame->loader()->documentLoader();
+        if (documentLoader && documentLoader->substituteData().isValid())
+            securityOrigin()->grantLoadLocalResources();
+    }
+
+    if (Settings* settings = this->settings()) {
+        if (!settings->isWebSecurityEnabled()) {
+          // Web security is turned off.  We should let this document access every
+          // other document.  This is used primary by testing harnesses for web
+          // sites.
+          securityOrigin()->grantUniversalAccess();
+
+        } else if (settings->allowUniversalAccessFromFileURLs() && securityOrigin()->isLocal()) {
+          // Some clients want file:// URLs to have universal access, but that
+          // setting is dangerous for other clients.
+          securityOrigin()->grantUniversalAccess();
+        } else if (!settings->allowFileAccessFromFileURLs() && securityOrigin()->isLocal()) {
+          // Some clients want file:// URLs to have even tighter restrictions by
+          // default, and not be able to access other local files.
+          securityOrigin()->enforceFilePathSeparation();
+        }
+    }
+
+    if (!securityOrigin()->isEmpty())
+        return;
+
+    // If we do not obtain a meaningful origin from the URL, then we try to
+    // find one via the frame hierarchy.
+
+    Frame* ownerFrame = m_frame->tree()->parent();
+    if (!ownerFrame)
+        ownerFrame = m_frame->loader()->opener();
+
+    if (ownerFrame) {
+        m_cookieURL = ownerFrame->document()->cookieURL();
+        // We alias the SecurityOrigins to match Firefox, see Bug 15313
+        // https://bugs.webkit.org/show_bug.cgi?id=15313
+        ScriptExecutionContext::setSecurityOrigin(ownerFrame->document()->securityOrigin());
+    }
+}
+
+void Document::setSecurityOrigin(SecurityOrigin* securityOrigin)
+{
+    ScriptExecutionContext::setSecurityOrigin(securityOrigin);
+    // FIXME: Find a better place to enable DNS prefetch, which is a loader concept,
+    // not applicable to arbitrary documents.
+    initDNSPrefetch();
+}
+
+#if ENABLE(DATABASE)
+
+bool Document::allowDatabaseAccess() const
+{
+    if (!page() || page()->settings()->privateBrowsingEnabled())
+        return false;
+    return true;
+}
+
+void Document::databaseExceededQuota(const String& name)
+{
+    Page* currentPage = page();
+    if (currentPage)
+        currentPage->chrome()->client()->exceededDatabaseQuota(document()->frame(), name);
+}
+
+#endif
+
+bool Document::isContextThread() const
+{
+    return isMainThread();
+}
+
+void Document::updateURLForPushOrReplaceState(const KURL& url)
+{
+    Frame* f = frame();
+    if (!f)
+        return;
+
+    // FIXME: Eliminate this redundancy.
+    setURL(url);
+    f->loader()->setURL(url);
+    f->loader()->documentLoader()->replaceRequestURLForSameDocumentNavigation(url);
+}
+
+void Document::statePopped(SerializedScriptValue* stateObject)
+{
+    if (!frame())
+        return;
+    
+    // Per step 11 of section 6.5.9 (history traversal) of the HTML5 spec, we 
+    // defer firing of popstate until we're in the complete state.
+    if (m_readyState == Complete)
+        enqueuePopstateEvent(stateObject);
+    else
+        m_pendingStateObject = stateObject;
+}
+
+void Document::updateFocusAppearanceSoon(bool restorePreviousSelection)
+{
+    m_updateFocusAppearanceRestoresSelection = restorePreviousSelection;
+    if (!m_updateFocusAppearanceTimer.isActive())
+        m_updateFocusAppearanceTimer.startOneShot(0);
+}
+
+void Document::cancelFocusAppearanceUpdate()
+{
+    m_updateFocusAppearanceTimer.stop();
+}
+
+void Document::updateFocusAppearanceTimerFired(Timer<Document>*)
+{
+    Node* node = focusedNode();
+    if (!node)
+        return;
+    if (!node->isElementNode())
+        return;
+
+    updateLayout();
+
+    Element* element = static_cast<Element*>(node);
+    if (element->isFocusable())
+        element->updateFocusAppearance(m_updateFocusAppearanceRestoresSelection);
+}
+
+// FF method for accessing the selection added for compatibility.
+DOMSelection* Document::getSelection() const
+{
+    return frame() ? frame()->domWindow()->getSelection() : 0;
+}
+
+#if ENABLE(WML)
+void Document::resetWMLPageState()
+{
+    if (WMLPageState* pageState = wmlPageStateForDocument(this))
+        pageState->reset();
+}
+
+void Document::initializeWMLPageState()
+{
+    if (!isWMLDocument())
+        return;
+
+    static_cast<WMLDocument*>(this)->initialize();
+}
+#endif
+
+void Document::attachRange(Range* range)
+{
+    ASSERT(!m_ranges.contains(range));
+    m_ranges.add(range);
+}
+
+void Document::detachRange(Range* range)
+{
+    // We don't ASSERT m_ranges.contains(range) to allow us to call this
+    // unconditionally to fix: https://bugs.webkit.org/show_bug.cgi?id=26044
+    m_ranges.remove(range);
+}
+
+CanvasRenderingContext* Document::getCSSCanvasContext(const String& type, const String& name, int width, int height)
+{
+    HTMLCanvasElement* result = getCSSCanvasElement(name);
+    if (!result)
+        return 0;
+    result->setSize(IntSize(width, height));
+    return result->getContext(type);
+}
+
+HTMLCanvasElement* Document::getCSSCanvasElement(const String& name)
+{
+    RefPtr<HTMLCanvasElement> result = m_cssCanvasElements.get(name).get();
+    if (!result) {
+        result = HTMLCanvasElement::create(this);
+        m_cssCanvasElements.set(name, result);
+    }
+    return result.get();
+}
+
+void Document::initDNSPrefetch()
+{
+    Settings* settings = this->settings();
+
+    m_haveExplicitlyDisabledDNSPrefetch = false;
+    m_isDNSPrefetchEnabled = settings && settings->dnsPrefetchingEnabled() && securityOrigin()->protocol() == "http";
+
+    // Inherit DNS prefetch opt-out from parent frame    
+    if (Document* parent = parentDocument()) {
+        if (!parent->isDNSPrefetchEnabled())
+            m_isDNSPrefetchEnabled = false;
+    }
+}
+
+void Document::parseDNSPrefetchControlHeader(const String& dnsPrefetchControl)
+{
+    if (equalIgnoringCase(dnsPrefetchControl, "on") && !m_haveExplicitlyDisabledDNSPrefetch) {
+        m_isDNSPrefetchEnabled = true;
+        return;
+    }
+
+    m_isDNSPrefetchEnabled = false;
+    m_haveExplicitlyDisabledDNSPrefetch = true;
+}
+
+void Document::reportException(const String& errorMessage, int lineNumber, const String& sourceURL)
+{
+    addMessage(JSMessageSource, LogMessageType, ErrorMessageLevel, errorMessage, lineNumber, sourceURL);
+}
+
+void Document::addMessage(MessageSource source, MessageType type, MessageLevel level, const String& message, unsigned lineNumber, const String& sourceURL)
+{
+    if (DOMWindow* window = domWindow())
+        window->console()->addMessage(source, type, level, message, lineNumber, sourceURL);
+}
+
+struct PerformTaskContext : Noncopyable {
+    PerformTaskContext(PassRefPtr<DocumentWeakReference> documentReference, PassOwnPtr<ScriptExecutionContext::Task> task)
+        : documentReference(documentReference)
+        , task(task)
+    {
+    }
+
+    RefPtr<DocumentWeakReference> documentReference;
+    OwnPtr<ScriptExecutionContext::Task> task;
+};
+
+static void performTask(void* ctx)
+{
+    ASSERT(isMainThread());
+
+    PerformTaskContext* context = reinterpret_cast<PerformTaskContext*>(ctx);
+    ASSERT(context);
+
+    if (Document* document = context->documentReference->document())
+        context->task->performTask(document);
+
+    delete context;
+}
+
+void Document::postTask(PassOwnPtr<Task> task)
+{
+    callOnMainThread(performTask, new PerformTaskContext(m_weakReference, task));
+}
+
+Element* Document::findAnchor(const String& name)
+{
+    if (name.isEmpty())
+        return 0;
+    if (Element* element = getElementById(name))
+        return element;
+    for (Node* node = this; node; node = node->traverseNextNode()) {
+        if (node->hasTagName(aTag)) {
+            HTMLAnchorElement* anchor = static_cast<HTMLAnchorElement*>(node);
+            if (inQuirksMode()) {
+                // Quirks mode, case insensitive comparison of names.
+                if (equalIgnoringCase(anchor->name(), name))
+                    return anchor;
+            } else {
+                // Strict mode, names need to match exactly.
+                if (anchor->name() == name)
+                    return anchor;
+            }
+        }
+    }
+    return 0;
+}
+
+String Document::displayStringModifiedByEncoding(const String& str) const
+{
+    if (m_decoder)
+        return m_decoder->encoding().displayString(str.impl());
+    return str;
+}
+
+PassRefPtr<StringImpl> Document::displayStringModifiedByEncoding(PassRefPtr<StringImpl> str) const
+{
+    if (m_decoder)
+        return m_decoder->encoding().displayString(str);
+    return str;
+}
+
+void Document::displayBufferModifiedByEncoding(UChar* buffer, unsigned len) const
+{
+    if (m_decoder)
+        m_decoder->encoding().displayBuffer(buffer, len);
+}
+
+void Document::enqueuePageshowEvent(PageshowEventPersistence persisted)
+{
+    // FIXME: https://bugs.webkit.org/show_bug.cgi?id=36334 Pageshow event needs to fire asynchronously.
+    dispatchWindowEvent(PageTransitionEvent::create(eventNames().pageshowEvent, persisted), this);
+}
+
+void Document::enqueueHashchangeEvent(const String& oldURL, const String& newURL)
+{
+    enqueueWindowEvent(HashChangeEvent::create(oldURL, newURL));
+}
+
+void Document::enqueuePopstateEvent(PassRefPtr<SerializedScriptValue> stateObject)
+{
+    // FIXME: https://bugs.webkit.org/show_bug.cgi?id=36202 Popstate event needs to fire asynchronously
+    dispatchWindowEvent(PopStateEvent::create(stateObject));
+}
+
+void Document::addMediaCanStartListener(MediaCanStartListener* listener)
+{
+    ASSERT(!m_mediaCanStartListeners.contains(listener));
+    m_mediaCanStartListeners.add(listener);
+}
+
+void Document::removeMediaCanStartListener(MediaCanStartListener* listener)
+{
+    ASSERT(m_mediaCanStartListeners.contains(listener));
+    m_mediaCanStartListeners.remove(listener);
+}
+
+MediaCanStartListener* Document::takeAnyMediaCanStartListener()
+{
+    HashSet<MediaCanStartListener*>::iterator slot = m_mediaCanStartListeners.begin();
+    if (slot == m_mediaCanStartListeners.end())
+        return 0;
+    MediaCanStartListener* listener = *slot;
+    m_mediaCanStartListeners.remove(slot);
+    return listener;
+}
+
+#if ENABLE(XHTMLMP)
+bool Document::isXHTMLMPDocument() const
+{
+    if (!frame() || !frame()->loader())
+        return false;
+    // As per section 7.2 of OMA-WAP-XHTMLMP-V1_1-20061020-A.pdf, a conforming user agent
+    // MUST accept XHTMLMP document identified as "application/vnd.wap.xhtml+xml"
+    // and SHOULD accept it identified as "application/xhtml+xml" , "application/xhtml+xml" is a 
+    // general MIME type for all XHTML documents, not only for XHTMLMP
+    return frame()->loader()->writer()->mimeType() == "application/vnd.wap.xhtml+xml";
+}
+#endif
+
+#if ENABLE(INSPECTOR)
+InspectorController* Document::inspectorController() const
+{
+    return page() ? page()->inspectorController() : 0;
+}
+#endif
+
+#if ENABLE(FULLSCREEN_API)
+void Document::webkitRequestFullScreenForElement(Element* element, unsigned short flags)
+{
+    if (!page() || !page()->settings()->fullScreenEnabled())
+        return;
+
+    if (!element)
+        element = documentElement();
+    
+    if (!page()->chrome()->client()->supportsFullScreenForElement(element))
+        return;
+    
+    m_areKeysEnabledInFullScreen = flags & Element::ALLOW_KEYBOARD_INPUT;
+    page()->chrome()->client()->enterFullScreenForElement(element);
+}
+
+void Document::webkitCancelFullScreen()
+{
+    if (!page() || !m_fullScreenElement)
+        return;
+    
+    page()->chrome()->client()->exitFullScreenForElement(m_fullScreenElement.get());
+}
+    
+void Document::webkitWillEnterFullScreenForElement(Element* element)
+{
+    ASSERT(element);
+    ASSERT(page() && page()->settings()->fullScreenEnabled());
+
+    m_fullScreenElement = element;
+    m_isFullScreen = true;
+    
+    if (m_fullScreenElement != documentElement())
+        m_fullScreenElement->detach();
+
+    recalcStyle(Force);
+    
+    if (m_fullScreenRenderer)
+        m_fullScreenRenderer->setAnimating(true);
+}
+    
+void Document::webkitDidEnterFullScreenForElement(Element*)
+{
+    if (m_fullScreenRenderer)
+        m_fullScreenRenderer->setAnimating(false);
+    m_fullScreenChangeDelayTimer.startOneShot(0);
+}
+
+void Document::webkitWillExitFullScreenForElement(Element*)
+{
+    if (m_fullScreenRenderer)
+        m_fullScreenRenderer->setAnimating(true);
+
+    recalcStyle(Force);
+}
+
+void Document::webkitDidExitFullScreenForElement(Element*)
+{
+    m_isFullScreen = false;
+    m_areKeysEnabledInFullScreen = false;
+
+    if (m_fullScreenRenderer)
+        m_fullScreenRenderer->remove();
+    
+    if (m_fullScreenElement != documentElement())
+        m_fullScreenElement->detach();
+    
+    setFullScreenRenderer(0);
+    recalcStyle(Force);
+    
+    m_fullScreenChangeDelayTimer.startOneShot(0);
+}
+    
+void Document::setFullScreenRenderer(RenderFullScreen* renderer)
+{
+    m_fullScreenRenderer = renderer;
+    
+    // This notification can come in after the page has been destroyed.
+    if (page())
+        page()->chrome()->client()->fullScreenRendererChanged(m_fullScreenRenderer);
+}
+    
+void Document::setFullScreenRendererSize(const IntSize& size)
+{
+    ASSERT(m_fullScreenRenderer);
+    if (!m_fullScreenRenderer)
+        return;
+    
+    if (m_fullScreenRenderer) {
+        RefPtr<RenderStyle> newStyle = RenderStyle::clone(m_fullScreenRenderer->style());
+        newStyle->setWidth(Length(size.width(), WebCore::Fixed));
+        newStyle->setHeight(Length(size.height(), WebCore::Fixed));
+        newStyle->setTop(Length(0, WebCore::Fixed));
+        newStyle->setLeft(Length(0, WebCore::Fixed));
+        m_fullScreenRenderer->setStyle(newStyle);
+    }
+}
+    
+void Document::setFullScreenRendererBackgroundColor(Color backgroundColor)
+{
+    if (!m_fullScreenRenderer)
+        return;
+    
+    RefPtr<RenderStyle> newStyle = RenderStyle::clone(m_fullScreenRenderer->style());
+    newStyle->setBackgroundColor(backgroundColor);
+    m_fullScreenRenderer->setStyle(newStyle);
+}
+    
+void Document::fullScreenChangeDelayTimerFired(Timer<Document>*)
+{
+    Element* element = m_fullScreenElement.get();
+    if (!element)
+        element = documentElement();
+    
+    element->dispatchEvent(Event::create(eventNames().webkitfullscreenchangeEvent, true, false));
+}
+
+#endif
+
+void Document::decrementLoadEventDelayCount()
+{
+    ASSERT(m_loadEventDelayCount);
+    --m_loadEventDelayCount;
+
+    if (frame() && !m_loadEventDelayCount && !m_loadEventDelayTimer.isActive())
+        m_loadEventDelayTimer.startOneShot(0);
+}
+
+void Document::loadEventDelayTimerFired(Timer<Document>*)
+{
+    if (frame())
+        frame()->loader()->checkCompleted();
+}
+
+#if ENABLE(TOUCH_EVENTS)
+PassRefPtr<Touch> Document::createTouch(DOMWindow* window, EventTarget* target, int identifier, int pageX, int pageY, int screenX, int screenY, ExceptionCode&) const
+{
+    // FIXME: It's not clear from the documentation at
+    // http://developer.apple.com/library/safari/#documentation/UserExperience/Reference/DocumentAdditionsReference/DocumentAdditions/DocumentAdditions.html
+    // when this method should throw and nor is it by inspection of iOS behavior. It would be nice to verify any cases where it throws under iOS
+    // and implement them here. See https://bugs.webkit.org/show_bug.cgi?id=47819
+    // Ditto for the createTouchList method below.
+    Frame* frame = window ? window->frame() : this->frame();
+    return Touch::create(frame, target, identifier, screenX, screenY, pageX, pageY);
+}
+
+PassRefPtr<TouchList> Document::createTouchList(ExceptionCode&) const
+{
+    return TouchList::create();
+}
+#endif
+
+static bool hasHeadSibling(const Document* document)
+{
+    Node* de = document->documentElement();
+    if (!de)
+        return false;
+
+    for (Node* i = de->firstChild(); i; i = i->nextSibling()) {
+        // A child of the document element which is rather than <head> is
+        // typically visible and FOUC safe. So we return true here.
+        if (!i->hasTagName(headTag))
+            return true;
+    }
+
+    return false;
+}
+
+bool Document::mayCauseFlashOfUnstyledContent() const
+{
+    // Some kind of FOUC is caused by a repaint request before page's <body> arrival
+    // because page authors often give background styles to <body>, not to <html>.
+    // (And these styles are unavailable before <style> or <link> is given.)
+    // This functions is used for checking such possibility of FOUCs.
+    // Note that the implementation considers only empty or <head> only contents as a FOUC cause
+    // rather than missing <body>, because non-HTML document like SVG and arbitrary XML from foreign namespace 
+    // should be painted even if there is no <body>.
+    if (didLayoutWithPendingStylesheets())
+        return true;
+    return !hasHeadSibling(this);
+}
+
+} // namespace WebCore